$\cos^2x\:\csc^2x=\csc^2x-1$
$13x+3y+2x+5y$
$\frac{d^2x}{d^2y}\left(7x^2+2y^2=4\right)$
$cosec\left(x\right)=1.305$
$\left|37\right|$
$4\:ln\:y\:=\:ln\:x$
$\frac{-12x^3+9x^2+20x-15}{4x-3}$
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