$\csc^2\left(x\right)+\cot^2\left(x\right)-\cos^2\left(x\right)-\sin2\left(x\right)$
$12-3x\ge-6$
$\frac{d^2}{dx^2}\frac{3r+2}{2r+3}$
$\frac{x^2-\left(a+1\right)x+a}{x^3-a^3}$
$\left(-14\right)-\left(-2\right)$
$-1-\left(-4\right)\left(3\right)\left(-2\right)$
$\left(3x+5\right)^2-\left(3x-5\right)^2$
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