$\int\frac{9}{3x^2\sqrt{4x^2-9}}dx$
$sin\left(tan^{-1}u-cos^{-1}v\right)$
$-100\cdot12$
$\frac{4x^2-3x}{x^2+9x}$
$6x^2=121$
$28x^2y-7xy$
$144y^2-100x^2$
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