Question

if cos7A=sin(A-6). where A is acute angle. Then show that value of A=12°.​

Answer 1

Answer:

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Step-by-step explanation:

cos A = sin (90 -A)

=⟩ sin ( 90 - 7A) = sin ( A - 6 )

=⟩ 90 - 7A = A - 6

=⟩ 96 = 8A

=⟩ A = 96/8

=⟩ A = 12° ( Hence Proved )