$\left(7y+8\right)\cdot\left(7y-8\right)$
$\frac{\sin^4x-\cos^4x}{\sin^2x+\sin x.\cos x}$
$\int\left(\frac{\left(2\cdot x^3+x^6-5\right)}{2\cdot x^3}\right)dx$
$17.5\cdot15.86$
$4a^4-16$
$mx-7x$
$\frac{6-2x^2}{x+3}$
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