$\int\left(4x\left(4+x^2\right)^{\frac{1}{2}}\right)dx$
$2x^2-14x+2y^2+18=7$
$3x^2-15$
$r\frac{dx}{dr}=x^2+1$
$4\sin^2+5\cos^2$
$2x^2+3x^2-7x^2+8x^2-x^2$
$\lim_{x\to0}\left(\frac{tan20x}{sin4x}\right)$
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