\displaystyle [br]\begin{equation*}\sin^2 t = (2\sin t\cos t)^2 = 2^2 \sin^2 t \cos^2 t = \cdots \end{equation*}
\displaystyle [br]\begin{equation*}\sin^2 t = (2\sin t\cos t)^2 = 2^2 \sin^2 t \cos^2 t = \cdots \end{equation*}
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