$\frac{1}{1-sinx}-\frac{1}{1+sinx}+2tanxsecx$
$\left(-3\right)\left(-8\right)\left(+4\right)\left(-2\right)$
$\left(3x-\frac{1}{2}y^2\right)^5$
$2x^2=x$
$35m^2n^2-70n^3$
$16x^2-16x-5$
$\left(-2\right)^{2}+\left(2\left(2\right)+4\left(-5\right)\left(1\right)$
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