$\left(-a+3\right)\left(-a-7\right)$
$2\cdot\cos^2\left(x\right)-\sin^2\left(x\right)=0$
$\cot^2x\left(1-\tan^2x\right)$
$\int_0^1\left(\frac{1}{3}t+-2\right)^2dt$
$42:3$
$\frac{3^{x+4}.\:3^{x+3}}{3^{x+2}.\:3^{x+1}}\:$
$\left(6m^4-n^4\right)^3$
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