$-\left(x-t\right)^2$
$\frac{cos^2x-cos2x}{\:0.5\:sin\:2x}$
$5\:+\:8\:+\:\left(-2\right)\:+\:\left(-1\right)+8\:+\:\left(-1\right)\:+\:9\:+\:\left(-5\right)$
$y'=y^2\cdot\left(5x+2\right)$
$\left(-6x^2\right):\left(x^2-x+3\right)$
$\int\frac{x^2}{16-x^4}dx$
$x^2+5x-14=0$
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