$cos\frac{21\pi\:}{10}sin\frac{3\pi\:\:}{20}+cos\frac{3\pi\:\:}{20}sin\frac{\pi\:\:\:}{10}$
$\left(3x-4\right)^2\left(3x+4\right)^2$
$292+517$
$x^2-21x+96$
$\frac{1}{2}b+2\le-6$
$\left(1+x^2\right)dy\:=\:sec^2y\:dx$
$y^{-4}y^3$
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