$15h-6-8+7h$
$\:\frac{6x^3y^2}{2y}$
$-2cos\left(2x\right)cos\left(x\right)$
$\frac{a^2-b^2}{b^2-a^2}$
$\lim_{x,y\to0,0}\left(\frac{25\sin^2\left(x\right)-9y^2}{5\sin^2\left(x\right)+3y}\right)$
$\sec\left(x\right)^2+\tan\left(x\right)=3$
$\log_f\left(256\right)=4$
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