Question

In right triangle ABC, C is the right angle. Which of the following is cos B if sin A = 0.4

Answer 1

Given that,

In right triangle ABC, C is the right angle.

sin A=0.4

To find cos B,

we get the triangle as,

we know that,

Hypotenuse of the triangle is AB

For the angle A, opposite side is CB

For the angle B, adjacent side is CB

From the definition of sine and cosine we get,

`\sin A=(CB)/(AB)`

Also,

`\cos B=(CB)/(AB)`

Comparing both we get,

`\sin A=\cos B`

It is given that sinA=0.4

Hence we get, cosB=0.4

Answer is: 0.4