$\lim_{x\to1}\left(\frac{x^3-2x+1}{x^3-x^2-x+1}\right)$
$\cos^2\left(a\right)+\sin^2\left(a\right)$
$2\left(7u\right)$
$\left(3x^3-4y^2\right)^2$
$\left(x+6\right)\left(x^2-4x+2\right)$
$\int_0^e\ln\sqrt{x}dx$
$-x^2=-4x+4y^2$
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