$\frac{7}{\cos\left(45\right)}$
$-7\left(-5-6\right)$
$+ab-8ab$
$\int sin\left(\frac{x}{2}\right)\cdot sin\left(nx\right)dx$
$\left(29+x\right)\left(-29+x\right)$
$2\sin^2x-\cos\left(x\right)=1$
$\frac{1}{\sin\left(x\right)}\left(1-\sin^2\left(x\right)\right)$
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