$\left(\cos\left(a\right)-\sin\left(a\right)\right)\left(\sec\left(a\right)+\csc\left(a\right)\right)$
$\left(sec\left(3\right)\:+\:cos\left(3\right)\right)\:\left(sec\left(3\right)\:-\:cos\left(3\right)\right)\:=\:tg^2\left(3\right)\:+\:sen^2\left(3\right)$
$\int\frac{t^2}{\sqrt{25-t^2}}dt$
$y^{12}\cdot y^9$
$\lim_{x\to16}\left(\frac{x-4}{\sqrt{x}-4}\right)$
$\int\left(7x^{\frac{3}{7}}+3x^{\frac{5}{3}}-x\right)dx$
$3\:x\:\left(-4\right)+\left(52+-4\:x\:2\right)-\left(-9.82\right)$
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