Question

Cos4A=Sin(A-20)

plzz answer

Answer 1

cos 4A = sin (A-20)

=> sin (90 - 4A) = sin (A-20)

=> 90 - 4A = A - 20

=> 110 = 5A

=> A = 22

Answer 2

Cos4A = Sin( A - 20)
Sin (90 - 4A) = Sin(A - 20)
90 - 4A = A - 20
-4A-A = -20-90
-5A = - 110
A = 110/5
A = 22