$\cos\left(2\pi x\right)^2$
$100x^4-400y^2$
$5x^2-25x+30$
$-x-6\left(2x+4\right)$
$\frac{d^2}{dx^2}\left(2x^4-x^5+5\right)$
$-2\left(-3x^2-2x+4\right)+2\left(-2x^2+3x+3\right)$
$\lim_{x\to0}\frac{x^3}{\left(1-cosx\right)\left(sinx\right)}$
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