# If A and B are angle and $\sin A = \cos B$, then $A+B$ =______
$\begin{array}{1 1}(A) \; 60^{\circ} \\(B)\;90^{\circ} \\(C)\;45^{\circ} \\(D)\;180^{\circ} \end{array}$
Answer : $(D)\;180^{\circ}$