$1+\sec^2=3\tan^2$
$\frac{2\sqrt{x}-5\sqrt{4x}}{\sqrt{x}+2}$
$\left(csc^2x-1\right)sec\:x=cot\:x\:csc\:x$
$5.-\:\left(\:-\:3\:\right)\:+\:\left(\:-\:4\:\right)\:+\:5\:+\:\left(\:-\:2\:\right)\left\{\right\}$
$4y+8y+12y^2$
$\left(x^5\right)\frac{1}{1+\left(x^2\right)}$
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