$cot\left(\theta\:\right)cos\left(\theta\:\right)csc\left(\theta\:\right)=csc^2\left(\theta\:\right)-1$
$a^2-5a+25$
$\frac{5x^2-8x+3}{21}$
$\lim_{x\to0}\:\left(7x\right)^{\sin\left(8x\right)}$
$p^2-22p+121$
$\frac{d^n}{dx^n}\left(x^5sin\left(x\right)\right)$
$x+2=\sqrt{x+7}$
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