$\left(\frac{1-\sin^2x}{1-cos^2x}+1\right)\tan^2x$
$\frac{2x-9}{10}$
$3+\left(-5\right)\left(2\right)-\left(-4\right)$
$7x^2+7x\:\cdot\left(12x^2\right)$
$36c^2-36cd+9d^2$
$-6+2\cdot3$
$\left(\frac{1}{2}a+\frac{2}{3}b^{2}\right)^{3}$
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