$\left(4x^2-x+6\right)-\left(-3x^2+5x+2\right)$
$\left(a^x-5\right)\left(a^x+3\right)$
$\cos\left(x\right)\cos\left(-x\right)-sin\:x\:sin\left(-x\right)=1$
$\frac{3\sqrt{3}}{3}$
$\int\frac{4}{x^2+5x-14}dx$
$\frac{dy}{dx}=y^2-6y$
$\frac{1-2\sin\left(y\right)-2\cos\left(y\right)}{2\sin\left(y\right)-\cos\left(y\right)}=-1$
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