 # Question: How Do You Find The Value Of Sin 15?

## How do you solve cos 75?

Answer and Explanation: The value of cos(75°) is √6−√24 6 − 2 4 .

Notice that we can write 75° as 30° + 45°..

## What is sin equal to?

Always, always, the sine of an angle is equal to the opposite side divided by the hypotenuse (opp/hyp in the diagram). The cosine is equal to the adjacent side divided by the hypotenuse (adj/hyp). (1) Memorize: sine = (opposite side) / hypotenuse. cosine = (adjacent side) / hypotenuse.

## What is the value of tan75?

tan(75°) = (√(3) + 1)/(√(3) – 1).

## Is sin 1 the same as Arcsin?

Strictly speaking, the symbol sin-1( ) or Arcsin( ) is used for the Arcsine function, the function that undoes the sine. … Think of the Arcsine as the principal arcsine. Restrict the domain to take this inverse function. A function can only be an inverse if it is 1-to-1 and undoes exactly the desired function.

## How do you find the exact value of sin 15?

Exact Value of sin 15°For all values of the angle A we know that, (sin A2 + cos A2)2 = sin2 A2 + cos2 A2 + 2 sin A2 cos A2 = 1 + sin A.Therefore, sin A2 + cos A2 = ± √(1 + sin A), [taking square root on both the sides]Now, let A = 30° then, A2 = 30°2 = 15° and from the above equation we get,More items…

## What is value of sin30?

0.5The 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.

## Is sin 1 the same as CSC?

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 .

## How do you find the value of sin 60?

Value of Sin 60 DegreeSin 0° = \sqrt{0/4} = 0.Sin 30° = \sqrt{1/4} = ½Sin 45° = \sqrt{2/4} = 1/√2.Sin 60° = \sqrt{3/4} = √3/2.Sin 90° = \sqrt{4/4} = 1.

## Is the value of sin 60?

The exact value of sin(60°) sin ( 60 ° ) is √32 .

## What is the formula for cos a B?

= sinA cosB − cosA sinB cos(A + B) = cosA cosB − sinA sinB cos(A − B) = cosA cosB + sinA sinB sin2 A + cos2 A = 1, sin 2A = 2 sinA cosA cos 2A = 2 cos2 A − 1=1 − 2 sin2 A 2 sinA cosB = sin(A + B) + sin(A − B) 2 cosA sinB = sin(A + B) − sin(A − B)

## What is tan15?

Hence, the value of tan (15°) is √3 – 1/√3 + 1. We can further resolve the above-resulted expression by putting the value of √3, which is equal to 1.732.

## What is an exact value?

BSL Maths Glossary – Exact value – Definition Subject level: Credit. 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.

## How do you solve 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 sin of 60 in radians?

Sines and cosines for special common anglesDegreesRadianssine90°π/2160°π/3√3 / 245°π/4√2 / 230°π/61/21 more row

## How do you find the value of sin 90?

Start measuring the angles from the first quadrant and end up with 90° when it reaches the positive y-axis. Now the value of y becomes 1 since it touches the circumference of the circle. Therefore the value of y becomes 1. Therefore, sin 90 degree equals to the fractional value of 1/ 1.

## What is the value of sin Square 15?

∴ sin 15° = (√3−1)/2√2 Register at BYJU’S to learn all about trigonometry and its formulas.