$f=2\pi\sqrt{\frac{m}{k}}$
$\left(\frac{2x}{3}-\frac{3x^2}{a}\right)^2$
$81-16-3$
$-5^2+2\left(-5\right)-5$
$8f^3m^3-125x^3$
$2\left(\frac{2}{x}\right)\left(\frac{3}{y}\right)$
$\int10x\left(5x^2+1\right)dx$
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