Question

if sin 4A=cos(A-10°), where 4A is an acute angle.find the value of A.​

Answer 1

Answer:

sin 4 A = cos (A-10')

(COS THETA = SIN (90-THETA))

SIN 4A = SIN (90-(A-10))

4A = 90-A+10

5A = 100

A = 20

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