Evaluate cos 30° sin 60° + cos 60° sin 30°.

Given that,

 cos 30° sin 60° + cos 60° sin 30°

Putting the values $$\begin{gathered} \cos 30° \sin 60° + \cos 60° \sin 30°.=\frac{\sqrt{3}}{2}.\frac{\sqrt{3}}{2}+\frac{1}{2}.\frac{1}{2} \\ =\frac{3+1}{4} \\ =\frac{4}{4} \\ =1 \end{gathered}$$