$2\left(t-2\right)+2=2\left(2t-5\right)$
$\frac{cosec\:x+sin\:x}{cosec\:x}$
$\int\frac{1}{\left(10-x\right)^2\left(5-x\right)}dx$
$\frac{21x^5-21y^5}{3x^2+2y^2}$
$\frac{d^2}{dx^2}\left(x^2+2y^2=1\right)$
$x+x^2-x^3$
$\frac{\cot+\tan}{\csc}-\frac{\csc}{\cot}$
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