$\left(4\sqrt{t}-1\right)^3$
$\tan^2a-\sec^2a$
$216-756+882a^2+343a^6$
$45\left(9+5n\right)$
$\frac{tan^2x-sec^2x}{cos^2x}=-sec\left(x\right)$
$\frac{dy}{dx}=-\frac{x^2}{y}$
$7\left(3+a\right)=7a$
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