$\frac{\sin\left(x\right)\tan\left(x\right)}{1-cos\left(x\right)}=\:\left(1+cos\left(x\right)\right)sec\left(x\right)$
$4x^{-1}-2x^{-1}$
$3\sin\left(x\right)-2=1$
$5\sqrt{x}^2$
$2x-2x$
$3b+5a+10a-2b-3a$
$\left(-1\right)\cdot\left(-2\right)\cdot\left(-3\right)\cdot\left(-4\right)$
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