$2cos^2\left(\frac{x}{2}\right)-1+cos\left(x\right)$
$\left(4+3x\right)\le9$
$\sec^2\left(x\right)+tan^2\left(x\right)+1=\frac{2}{cos^2\left(x\right)}$
$csc^2\left(x\right)+3csc\left(x\right)+2=0$
$2\sqrt[2]{5}+5\sqrt[2]{5}$
$\frac{1}{2}a-\frac{3}{4}a^2$
$3x+3x+3x+3x+3x+3x$
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