# Quick Answer: How Do You Find The Value Of Sin 30?

## How do you find the value of sin 18?

Exact Value of sin 18°How to find exact value of sin 18°?Let A = 18°Therefore, 5A = 90°⇒ 2A + 3A = 90˚⇒ 2θ = 90˚ – 3A.Taking sine on both sides, we get.sin 2A = sin (90˚ – 3A) = cos 3A.⇒ 2 sin A cos A = 4 cos^3 A – 3 cos A.More items….

## What is the exact value of π?

approximately 3.14Succinctly, pi—which is written as the Greek letter for p, or π—is the ratio of the circumference of any circle to the diameter of that circle. Regardless of the circle’s size, this ratio will always equal pi. In decimal form, the value of pi is approximately 3.14.

## How do you find the value of sin 30 degrees?

To find the value of sin 30 degree, we will use the following formula, Sinϴ = Perpendicular Hypotenuse. Thus, the value of Sin 30 degree is equal to 12(half) or 0.5.

## How do you find the value of sin?

Now as per sine, cosine and tangent formulas, we have here:Sine θ = Opposite side/Hypotenuse = BC/AC.Cos θ = Adjacent side/Hypotenuse = AB/AC.Tan θ = Opposite side/Adjacent side = BC/AB.

## How do you find the value of sin 75?

Answer. Sin(A+B) = Sin A Cos B + Cos A Sin B. Sin 75 = Sin ( 45 + 30) = Sin 45 Cos 30 + Cos 45 Sin 30. Sin 75 = (1 / √2) ( √3 / 2) + (1 / √2) ( 1 / 2) = [ √3 + 1] / 2√2.

## Is sin 1 the same as CSC?

So far in this course, the only trigonometric functions which we have studied are sine and cosine. … The secant of x is 1 divided by the cosine of x: sec x = 1 cos x , and the cosecant of x is defined to be 1 divided by the sine of x: csc x = 1 sin x .

## What is the exact value of sin105?

sin(105) is equal to sin(60 + 45). since you can find the exact sine and cosine values of 60 and 45 degrees, you can use this the sum formula to find the exact value of sine of 105.

## What is the exact value of sin degrees?

Sine 30 Degrees Value The exact value of sin 30 degrees is ½. To define the sine function of an angle, start with a right-angled triangle ABC with the angle of interest and the sides of a triangle.

## How do you find tan 30?

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.

## What is an exact value?

Definition. Exact value is where you cannot estimate the value you must be precise, eg; you can’t estimate something as being around about 5 centimetres; no you need an exact value such as 5.62. Exact value. Return to Mathematics Home.