$\left(1+\cos^2x\right)\left(1+\tan^2x\right)$
$9a^2-15ab$
$\left(m^{\left(3\right)}-4\right)\left(m^{\left(3\right)}-8\right)$
$\tan a+\cot a.\csc a$
$\lim_{a\to3}\left(\frac{a^{3}-3a^{2}-a+3}{a^{2}-2a-3}\right)$
$3u^2+8u-3$
$\frac{x^2}{x+3}+\frac{x-6}{x+3}$
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