$\frac{1+\sin a}{\cos a}-\frac{\cos a}{1+\sin a}=2\sec a$
$x^2-16\ge1000$
$\frac{dy}{dx}=\frac{-sen2x+2xy^2}{2y\left(1-x^2\right)}$
$\left|1+\left(1-3-5\right)\right|$
$\frac{\sqrt{1+tanx}\:-\:\sqrt{1+sinx}}{x\cdot x\cdot x}$
$-3a^2+3a-2a^2+a-5a+2a^2$
$16x^2-+196$
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