$f\left(x\right)=\frac{1}{\left(1+3x\right)^2}$
$\frac{cosx+secx}{tanx}$
$x^2-8x+16=225$
$x+3\sqrt{8x^4}-9x^2+3x$
$\left(2\cdot3^5\right)^{-2}$
$4x+12y=20$
$\frac{3}{2}\cot30$
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