$x^2dx+2ydy$
$x-5+8$
$\frac{15}{x}-2=\frac{72-6x}{2x^2}$
$\frac{x^4+6x^2-10}{x+1}$
$\cos\left(\frac{\pi}{2}-a\right)$
$0.0004^2\cdot3.1416$
$6y-30$
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