Question

Evaluate:
cos(50+°θ)–sin(40°-θ)

Answer 1

cos(50°+θ)-sin(40-θ)=sin(90°-50°-θ)-sin(40°-θ)
                                 =sin(40°-θ)-sin(40°-θ)
                                 =0

Answer 2

0.21985287 is the answer.....