**Cos Theta is equivalent to Sin (90 – Theta).**

### What does 90 degrees minus theta mean?

Trigonometric ratios of 90 degree minus theta is**one of the branches of ASTC formula in trigonometry**. Trigonometric-ratios of 90 degree minus theta are given below. sin (90° - θ) = cos θ cos (90° - θ) = sin θ

### What is the value of sin minus theta?

sin(-θ) =**– sinθ**

### What is COT 90 minus theta?

The value of cot 90 minus theta can be written as cot(90° – θ) and its value is**tan θ**. Therefore, cot(90° – θ) = tan θ.

### What is minus theta?

trigonometric ratios of minus theta|**sin(−Θ)=−sinΘ**,cos(−Θ)=cosΘ

### What is the value of cos 90 degree theta?

The value of cos 90° is equal to the x-coordinate (0). ∴**cos 90° = 0**.

### What is sin 90 degrees in fraction?

Hence, Sin 90° will be equal to its fractional value i.e.**1/1**.

### What is the formula of sin A minus B?

Sin(a - b) formula in trigonometry is given as,**sin (a - b) = sin a cos b - cos a sin b**.

### What is the value of sin 180 degree minus theta?

In trigonometry, the exact value of sin 180 is**0**.

### What is the value of tan 90 minus theta?

The exact value of tan 90 is**infinity or undefined**.

### Why is COS 90 theta sin theta?

Expert-verified answer**the value of sinΘ and cos(90-Θ) are the same**. we write Sin Theta = Cos (90 - Theta) and Cos Theta = Sin (90 - Theta). 30 and 60 are the complimentary angles. The inverse is also true.

### What is sin 270 minus theta?

Trigonometric ratios of 270 degree minus theta is one of the branches of ASTC formula in trigonometry. Trigonometric-ratios of 270 degree minus theta are given below. sin (270° - θ) =**- cos θ**cos (270° - θ) = - sin θ tan (270° - θ) = cot θ

### What is the exact value of sin (- 210?

The exact value of sin 210 degrees is**-0.5**.

### What is tan 180 degree minus theta?

tan (180° - θ) = cos (90° + 90° - θ) = tan [90° + (90° - θ)] = - cot (90° - θ), [since tan (90° + θ) = -cot θ] Therefore, tan (180° - θ) =**- tan θ**, [since cot (90° - θ) = tan θ]

### What is θ in math?

θ theta.**Commonly used as a variable to indicate an**.

**angle**.

### What is inverse of sine?

What is**arcsin**? Arcsine is the inverse of sine function. It is used to evaluate the angle whose sine value is equal to the ratio of its opposite side and hypotenuse. Therefore, if we know the length of opposite side and hypotenuse, then we can find the measure of angle.

### What is sin to the negative 1?

The inverse sin of 1, i.e., sin^{-}

^{1}(1) is a very unique value for the inverse sine function. Sin

^{-}

^{1}(x) will give us the angle whose sine is x. Hence, sin

^{-}

^{1}(1) is equal to the angle whose sine is 1. Since the inverse sin

^{-}

^{1}(1) is

**90° or Π/2**.

### What is sin a minus sin B?

The Sin A - Sin B difference to product formula in trigonometry for angles A and B is given as, Sin A - Sin B =**2 cos ½ (A + B) sin ½ (A - B)**

### What is sinA * cosB?

Sin a cos b is**a trigonometric identity used to solve various problems in trigonometry**. Sin a cos b is equal to half the sum of sine of the sum of angles a and b, and sine of difference of angles a and b.

### What is the value of sin a B sin A minus B?

→ Sin(A+B) + Sin(A-B) =**2 sinA.**

**cosB**.

### What is value of sin30?

The value of sin 30 degrees is 0.5. Sin 30 is also written as**sin π/6**, in radians. The trigonometric function also called as an angle function relates the angles of a triangle to the length of its sides.

### Why is sin 1 90 degrees?

sinx is the y coordinate on the unit circle and cosx is the x coordinate. If you use your intuition**a 90 degrees cosx must be 0 because its a straight line up and sinx must be 1**.

### What quadrant is sin 90 theta in?

(90° + θ) falls in the**second quadrant**In the second quadrant (90° + θ), sin and csc are positive and other trigonometric ratios are negative.

### What is value of cos45?

Cos 45° Value The approximate value of cos 45 is equal to 0.7071. Therefore, 0.7071 or**1/√2**is a value of a trigonometric function or trigonometric ratio of standard angle (45 degrees).

### How do you solve cos45?

The value of cos 45 degrees can be calculated by**constructing an angle of 45° with the x-axis, and then finding the coordinates of the corresponding point (0.7071, 0.7071) on the unit circle**. The value of cos 45° is equal to the x-coordinate (0.7071). ∴ cos 45° = 0.7071.

### What is tan30 degree?

In trigonometry, the tangent of an angle in a right-angled triangle is equal to the ratio of opposite side and the adjacent side of the angle. Tan 30 degrees is also represented by tan π/6 in terms of radians. The exact value of tan 30° is 0.57735. Tan 30° =**1/√3 = 0.57735**.

### What is the exact value of sin45?

The exact value of Sin 45 degree in decimal form is**0.7071067812**.

### What is 90 degrees in a fraction?

90 degrees =**1/4**Below is an illustration showing you what 90 degrees and 1/4 of a circle looks like.

### Can you use sin 90 in law of sines?

The short answer is that**you can't construct a right angle triangle to visualise sin90∘**. The "opposite" (or "perpendicular" as per your nomenclature) side has to be distinct from the hypotenuse, it cannot be the same side.

### How do you derive sin30?

The value of sin 30 degrees can be calculated by**constructing an angle of 30° with the x-axis, and then finding the coordinates of the corresponding point (0.866, 0.5) on the unit circle**. The value of sin 30° is equal to the y-coordinate (0.5). ∴ sin 30° = 0.5.

### What is Cosec (- theta?

The cosecant function 'or' Cosec Theta is**one of the trigonometric functions apart from sine, cosine, tangent, secant, and cotangent**. In right-angled trigonometry, the cosecant function is defined as the ratio of the hypotenuse and opposite side.

### What is the formula of sin2A?

The general formula of sin2A is,**sin2A = 2 sin A cos A**. Using sin

^{2}A + cos

^{2}A = 1, we get sin A = √(1 - cos

^{2}A). Substituting this in the given formula, sin2A = 2 √(1 - cos

^{2}A) cos A. This formula is in the terms of cos or cosine function only.

### What is the formula of Cos A minus B?

Cos(a - b) is one of the important trigonometric identities, also called the cosine subtraction formula in trigonometry. Cos(a-b) can be given as,**cos (a - b) = cos a cos b + sin a sin b**, where 'a' and 'b' are angles.

### What is sinA equal to?

sinA. =**1**.

**tanA**. sin(A ± B) = sinAcosB ± cosAsinB.

### What is the equivalent of 2sinbcosb?

What is 2SinACosB Equal to? 2sinAcosB is equal to the sum of sin(A + B) and sin(A - B), that is, 2sinAcosB is equal to**sin(A + B) + sin(A - B)**.

### What is sin3x formula?

sin 3x =**sin (2x + x)**

### What is the sin of θ 42?

Sin 42 degrees is the value of sine trigonometric function for an angle equal to 42 degrees. The value of sin 42° is**0.6691 (approx)**.

### What is the value of sin 1 (- 1 2?

Therefore, the principal value of sin−1(−21) is**−6π**Was this answer helpful?

### Where does sin equal zero?

sin x = 0 is for**x = nπ where n is an integer**e.g., -3,-2,-1,0,1,2,3,......... and x is in radian.

### What is the exact value of sin 1 (- 1?

Trigonometry Examples The exact value of sin-1(−1) is**−π2**.

### Is θ a number?

Theta (uppercase Θ, lowercase θ) is the eighth letter of the Greek alphabet, derived from the Phoenician letter Teth.**In the system of Greek numerals it has a value of 9**.

### What is tan minus theta?

tan (- θ) =**- tan θ**.

### What is the value of cos 180 degree minus theta?

Therefore, the value of cos 180° is**-1**.

### What is sin 180 plus theta?

sin (180° + θ) = sin (90° + 90° + θ) = sin [90° + (90° + θ)] = cos (90° + θ), [since sin (90° + θ) = cos θ] Therefore, sin (180° + θ) =**- sin θ**, [since cos (90° + θ) = - sin θ]