$\frac{5-\sqrt{-5}}{5}$
$\frac{1-cos^2x}{-sinx}=-sinx$
$\int x^2\sqrt{1-4x}dx$
$\frac{dy}{dx}+50\cdot y=1200\cdot sin\left(60\cdot x\right)$
$cos67.5$
$2d^2-4d+6$
$\left(7x^3+y^2\right)\left(7x^3-y^2\right)$
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