Relasi sudut

\begin{equation*}
\begin{split}
& \sin (180 - x)^{\text{o}} \:.\: \cos (270 - x)^{\text{o}} \:.\: \cot (360 - x)^{\text{o}} \\\\
& \sin x \:.\: - \sin x \:.\: - \cot x \\\\
& \sin x \:.\: \sin x \:.\: \frac {\cos x}{\sin x} \\\\
& \sin x \:.\: \cancel {\sin x} \:.\: \frac {\cos x}{\cancel {\sin x}} \\\\
& \sin x \:.\: \cos x
\end{split}
\end{equation*}