Question

If sin4A=cos(A-20). Then find the value of

Answer 1

Answer:

▪️sin4A=cos(A-20)

▪️cos(90-4A) = cos(A-20)

▪️so

▪️90 - 4A = A - 20

▪️5A = 110

▪️A = 22°

hope this will help you____^_^_