$13\cdot0.20$
$\cos^2\left(x\right)-\sin^2\left(x\right)\cos^2\left(x\right)=\cos^4\left(x\right)$
$\int-3x^{-2}dx$
$a\left(b\:-\:2\right)\:+\:c\left(b\:-\:2\right)$
$2sin^2x-9sinx+4=0$
$\frac{2\tan3a}{1-\tan^23a}$
$\left(-5an\right)^3$
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