$\left(-7y-3\right)\left(-11+2y\right)$
$\frac{d}{dx}\frac{4\sin\left(x\right)}{3\cos\left(x\right)}$
$\csc^4\left(x\right)-\cot^4x=2\csc^2\left(x\right)-1$
$30-2\cdot10+5\cdot2$
$131-12$
$\left(\frac{1}{7}a^2b^3-\frac{2}{5}c^3\right)\left(\frac{1}{7}a^2b^3-\frac{2}{5}c^3\right)$
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