Question

Cos 4A= sin(A-15), then find the value of A

Answer 1

Answer:

21°

Step-by-step explanation:

Given,

cos 4A = sin (A-15)

sin (90-4A) = sin (A-15)

Removing sin on both sides

90 - 4A = A - 15

5A = 105

A = 21°

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