$3\left(1-cos^2x\right)=3\tan^2\left(x\right)$
$\frac{20x^3}{\left(5x^2\right)^3}$
$\int5\pi f^3df$
$\lim_{x\to0}\left(\frac{7^x-3^x}{1-cos\sqrt{x}}\right)$
$ydy-6xdx=0$
$\left(5a^2-4b^3\right)^3$
$6x^3\left(x^2-3x^4\right)$
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