$\int x\:\arccot\left(x^2\right)\:dx$
$\int t^3\left(3+t^4\right)^2dt$
$12-36+15.-3.-6.\left(-9\right)$
$4r^2+12rt+9t^2$
$225x^2-30x+1$
$\int csc^2\left(x+1\right)dx$
$\:\sin\:\left(30^{\circ\:}\:+\:x\right)\:-\cos\:\left(60^{\circ\:}\:+\:x\right)=\:-\frac{\sqrt{3}}{2}$
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