Question

If 3A=90° then, the value of cosA will be​

Answer 1

Answer:

√3/2

Step-by-step explanation:

Since

3A = 90

A= 30

Therefore CosA = Cos30= √3/2

Answer 2

It is a simple problem .the solution is not that difficult.so I would focus more on getting the idea.

Imagine a right angled triangle with hyportu use 1 and one angle 3A.so side opposite to that angle can be described by sin(3A).but it is nearer side to (90–3A).so it can also be described as cos(90–3A)

This is equal to cos(A-26)

So A-26=90–3A

4A=116

A=116/4=29

There are of course any solution +2*pi to 26 will satisfy this