$-10=2\left(u+5\right)-7u$
$\frac{2x^2-5x-7}{x+2}$
$3\cos^2x-2\sin^2x=0$
$\int\:15\:csc\:8x\:cot\:8x\:dx$
$\frac{d}{dx}s^2+\frac{1}{4}i^2=si+i$
$\frac{4x^3-2x+5}{2x-2}$
$4\left(2e-6\right)$
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