$3\sin^2x=0$
$\left(2x-5\right)^2=\left(6x+1\right)^2$
$\left(1-\left(.75\right)xy\right)^2$
$x+3\ge5$
$\lim_{x\to1}\left(\frac{x^4-1}{2x^3-5x+3}\right)$
$\int_{-2}^1\:\frac{1}{x^4}dx$
$\frac{d}{dx}cos9x$
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