$x+\frac{1}{y}=5$
$-5x^2-75x-270$
$\frac{1-\cos^2x}{\sin x\cos x}=\tan x$
$\int1dz$
$\left(x^4-3\right)\cdot\left(x^4+3\right)$
$-4by+3b^2y+4-+10+5by$
$\frac{dy}{dx}=\frac{\left(lnx\right)^4}{xy^2}$
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