Answer
$\sin30\approx-0.9880$ whereas $\sin 30^{\circ}=\frac{1}{2}$
Work Step by Step
It is true that $\sin 30^{\circ}=\frac{1}{2}$. However, the expression in the question is not $\sin 30^{\circ}$,rather it is $\sin 30$. This means that the '$30$' in the expression refers to radians, not degrees. Using a calculator, $\sin30$ is found to be approximately equal to $-0.9880$.
