Question

Cos(π/3 + 3x) = sin (-π/5)

Answer 1

Verified answer

Cos (π/3 + 3x) = sin (-π/5)
cos (π/3 + 3x) = - sin (π/5)
cos (180/3 + 3x) = - sin (180/5)
cos (60 + 3x) = - sin (36)
cos (60 + 3x) = cos (270+36)
cos (60 + 3x) = cos 306
60 + 3x = 306
3x = 306 - 60
x = 246/3
x = 82°