$\sec\left(1+\cos\left(x\right)\right)\left(1-\cos\left(x\right)\right)$
$\left(5.8\cdot10^{-9}\right)\cdot\left(6.1\cdot10^7\right)$
$\int\frac{x^2-7}{x^2\left(x+5\right)\left(x-3\right)}dx$
$2x^4-3x^3+8x-5;x=3$
$\frac{dy}{dx}=\frac{-y^2+x^2}{2xy}$
$x+20<8$
$\cos^2\left(2a\right)-2\sin\left(2a\right)+2$
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