
Mark M. answered 09/14/20
Tutor
5.0
(278)
Mathematics Teacher - NCLB Highly Qualified
sin (θ + 15) = cos (2θ + 30)
sin (θ + 15) = cos 2(θ + 15)
sin (θ + 15) = 1 - sin2 (θ + 15)
Now solve the quadratic for θ