$\int3x\sqrt{4+x^2}dx$
$-15-12-5-6+20$
$\int39x^2\sin\left(2x\right)dx$
$-\left(-7n+8\right)+8$
$\:4-x<\:8$
$\int6sec\left(x\right)tan\left(x\right)^2dx$
$\frac{\frac{-2\sin\left(x\right)}{\cos^2\left(x\right)}}{1-\frac{1}{\cos^2\left(x\right)}}$
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