Answer
$\sin$ 38.7$^{\circ}$ = $\cos$ 51.3$^{\circ}$
Work Step by Step
According to the Cofunction Identities
$\sin$ $A$ = $\cos$ (90$^{\circ}$ - $A$)
Therefore:
$\sin$ 38.7$^{\circ}$ = $\cos$ (90$^{\circ}$ - 38.7$^{\circ}$)
= $\cos$ 51.3$^{\circ}$
Therefore:
$\sin$ 38.7$^{\circ}$ = $\cos$ 51.3$^{\circ}$
