$-1-tan^2x+csc^2x\cdot tan^2x+csc^2x=csc^2x$
$\int\tan6y\:dy$
$-x^2-4x-1$
$3x^2+4\ge2x^2+5x$
$\int\frac{-3}{x^2\sqrt{x^2-9}}dx$
$-7\left(6+2u\right)-8$
$a^3\cdot a^2\cdot b$
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