$\sin\left(2\cos^{-1}\frac{1}{6}\right)$
$-x-23x-16$
$\sin\left(7x\right)\sin\left(9x\right)-\cos\left(7x\right)\cos\left(9x\right)$
$\frac{\cos^2\left(a\right)+\sin\:^2\left(a\right)}{\left(\frac{\sin\:\left(a\right)}{\cos\:\left(a\right)}\right)^2+1}=cos^2\:a$
$\left(x^2+4\right)\left(x^4+16\right)$
$\left(\frac{dy}{dx}\right)=2x$
$\lim_{x\to1}\left|x\right|cos\left(\frac{1}{x-1}\right)$
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