Question

sin4A=cos(A-10) Find the value of A.
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Answer 1

Answer:

sin4A = cos(A - 10)

=> cos (90 - 4A) = cos (A - 10)

=> 90 - 4A = A - 10

=> -4A - A = - 10 - 90

=> - 5A = - 100

=> 5A = 100

=> A = 100/5

=> A = 20

Ans. 20

Hope it helps.