Find the measure, in degrees, of the smallest positive angle $\theta$ for which $\sin 3 \theta = \cos 17 \theta$.
sin 3θ = cos 17θ
Since sine and cosine are co-functions we can solve this
3θ + 17θ = 90
20θ = 90
θ = 90 /20 = 9/2 = 4.5°