$sin^2\left(x\right)\:sec^2\left(x\right)-sin^2\left(x\right)\:$
$9x^3+2x+\frac{x^3}{5}-2x$
$-2x+x^2+3^2+6x$
$\frac{x}{3x^{2+1}}$
$\int\frac{\sqrt{25x^2-225}}{x}dx$
$u+18=14$
$x^4\:+27x$
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