$\tan^2x\sec^3x$
$-\left(-3\right)^0$
$5\cdot5+8\cdot5$
$7u^4-7u^2v^2$
$2y^2-8$
$2\sin\left(2x\right)-\cos\left(2x\right)=-1$
$\log\left(x-y\right)=1$
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