$9x^2+16y^2=49$
$\left(3ax^3-10bx^2-12x\right)+\left(13ax^3+10bx^2-12x-16\right)$
$\left(7-5y\right)^2$
$y=\left(x^5+x^{10}\right)^{20}$
$y'+2y=8$
$2x^2y+\frac{1}{3}x^2y-3x^2y+5x^2y$
$2x'+4x=t^2+2t$
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