Question

if sin Φ=cos(Φ-45),where ΦandΦ-45 are acute angles find the degree measure of Φ​

Answer 1

Answer:

sin a = cos (a-45)

cos (90 - a) = cos (a - 45)

90 -a = a - 45

90 + 45 = a + a = 2a

a = 135/2 = 67.5 degree Ans