$\int\frac{-x+e^x}{e^x}dx$
$\frac{csc\left(t\right)-sin\left(t\right)}{cot\left(t\right)}$
$7x^2-70x-21$
$64a^2+762a^2+49$
$-3\cdot6^2-2^5$
$5-2\sin\left(-2x\right)=7$
$\cos\left(3x\right)=\sin\left(3x\right)$
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