$dy=\frac{y+6}{x+4}dx$
$\frac { 7 x ^ { 2 } } { 1 }$
$\frac{9y^2z^4}{27yz^2}$
$\frac{3^7}{3^4}$
$9+6^2-2\cdot8$
$\frac{9x^2-12x+4}{3x-2}$
$1=\left(1-cos^2x\right)\left(1+cot^2x\right)$
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