$2\sin^2\left(x\right)=2-2\cdot\cos\left(x\right)$
$\frac{1-sen^2x}{sec^2x}\:=\:cos^2x$
$\sec^2x+3\tan x+1$
$\frac{3x+9x^2}{3x}$
$5.7+\left(3z+0.3\right)$
$\lim_{x\to\infty}\left(5^{x+2}\right)$
$\left(1-i\right)^3$
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