$\frac{\sin^2x}{\sec^2x-1}$
$-15-20-300$
$\left(3x+1\right)+\left(3x-1\right)$
$49m^4-70am^2n^2+25a^2n^4$
$\left(2w^2\cdot3w^3\right)^3$
$\int\frac{x}{\sqrt{7+x^2}}dx$
$\frac{64}{-32}$
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