Question

if sin 5A=cos(A+30) where A is an acute angle then angle A =

Answer 1

Answer: please mark as brainliest

Step-by-step explanation:

sin 5A =cos 4A

we know sin (90-@) =cos@

use this

sin 5A = sin (90-4A)

5A = 90 -4A

9A = 90

A= 10

Answer 2

Answer

Sin 5A=cos (A+30) (given) (1)

We know that

Sin A= cos (90-A)

So, Sin 5A= cos (90-5A) (2)

From 1 and 2

Cos (A+30) =cos (90-5A)

A+30=90-5A

A+5A =90-30

6A=60

A=10