$x^2+y^2-18x+12y+144=25$
$16x^2-96x$
$\left(1-cos^2\:x\right)cos^2x$
$cotx-\csc x$
$\int x\left(x^2+1\right)^8dx$
$-69x^2+81$
$\int\frac{\sec^2\left(x\right)}{1+9tan^2x}dx$
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