$\int\:\:\frac{x^3}{\sqrt{x^2-4}}dx$
$x^{\left(2\right)}\left(x\left(4x+1\right)\left(4x^{\left(2\right)}+2x-6\right)+3\left(2x^{\left(2\right)}+x-3\right)^{\left(2\right)}\right)$
$7x^5-\:2x^4\:+\:3x^2;\:x=2$
$10=\frac{t}{2}$
$x^2-8x-15=-x^2$
$2\cos^2x-5\cos x+2=0$
$6x^2-116x+412=3x^2-68x-220$
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