$\int7tan^2xdx$
$\frac{\cos\left(x\right)+\sin\left(x\right)}{\cos\left(x\right)-\sin\left(x\right)}=\frac{1}{2}$
$3a^2b\left(5a^2b+11ab-5b^2\right)$
$23^2-2^3$
$-x^3+9x^2-24x+20$
$\left(x-3\left(x+3\right)\right)$
$\frac{\sin^2\left(-x\right)-\cos^2\left(-x\right)}{\sin\left(-x\right)-\cos\left(-x\right)}$
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