$31-9x=11+11x$
$\int\sec^22x\:\cos^2\:2x\:dx$
$7x+4=8x-2$
$1+1-1\:\cdot\:1$
$\left(3\right)\left(9y^3\right)\left(7\right)$
$\cos\left(a-b\right)-\sin\left(a\right)\cdot\sin\left(b\right)$
$-\frac{yx^4}{-3x^3y^{-3}}$
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