$\int_{\frac{-\pi}{2}}^{\frac{\pi}{2}}\frac{\sin\left(2x\right)}{1+\cos\left(x\right)}dx$
$\left(6y^2-7y+9y^3-8+3y^4\right)\left(-5+3y+5y^2\right)$
$\frac{9x^2}{-3x^2}$
$45\cdot100$
$49c^2+70cd+25d^2$
$4x^2\le0$
$x+6\le14$
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