$\frac{dy}{dx}+y=2$
$sec^2x-sin^2x-cos^2x\:=\:tan^2x$
$tg\left(-240^{\circ}\right)+sec\left(\frac{5\pi\:}{3}\right)$
$s+0.21s-0.15s$
$11 ( x - 5 )$
$\lim_{x\to-1}\left(\frac{\left(x+1\right)^3}{x^3+1}\right)$
$\int7cos8xcos3xdx$
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