$\frac{\sin\left(x\right)}{1-\sec\left(x\right)}\cdot\frac{1+\sec\left(x\right)}{1+\sec\left(x\right)}$
$13+15\cdot200$
$-2x^2y^3;\:x=2;y=2$
$9b^2-7b^2-7+7$
$\lim_{x\to0}\left(1-sin\:y\right)^{\frac{1}{2y}}$
$\left(y^2-2y+2\right)^3$
$4x-\frac{5}{4x^2}+c$
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