$\sec\left(a\right)-\cos\left(a\right)=\tan\left(a\right)\cdot\sin\left(a\right)$
$16-5x\ge3x$
$\frac{dy}{dx}=4x^8y^6$
$36x^2+12xy^2+y^4$
$9x-9-8x-32$
$\frac{1}{x-5}+\frac{1}{x-5}=\frac{4}{x^2-25}$
$-\left(-\frac{2}{7}\right)\:x\:\left(-\frac{1}{3}\right)$
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