$\frac{1-\text{sen}^2a}{\sec^2a}=\cos a$
$6-9\left(-x+1\right)$
$\frac{d}{dx}sin\left(x+y\right)e^y=\sqrt{y}$
$9g+30$
$\int e^{\frac{1}{\sec2x}}\sin2xdx$
$\frac{4x}{x-1}+2\ge0$
$\int\frac{t^3}{\sqrt{16-t^2}}dt$
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