$\frac{1}{\sqrt{1-y^2}}dy=xdx$
$\frac{\cos\left(y\right)+cot\left(y\right)\left(\sin\left(y\right)\right)}{2\tan\left(\frac{\pi}{2}-y\right)}$
$\left(-12\right)+\left(-15\right)-8+\left(-8\right)$
$x^3-\:5x^2\:+4x\:+\:1,\:x=2$
$3\left[15\:-\:7\left(2\right)\right]\:-\:\left[27\left(-4\right)\:+\:\left(-9\right)\left(-12\right)\right]\:$
$tanxsecx-2tanx-secx+2=0$
$\frac{144x^4-900y^8}{12x^2-30y^4}$
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