$\frac{d^2}{dx^2}\left(\frac{1}{x^2}\right)$
$\left(7f-3\right)^4$
$\frac{10\sin^2a-7\cos a+2}{3+2\cos a}$
$sin^2x+sin^2x$
$\frac{144}{81}a^2+625a^{10}m^4x^6+\frac{200}{3}a^6m^2x^3$
$\frac{x-1}{x^3+x}$
$\lim_{x\to+\infty}\sqrt[2]{4x^2+3}$
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