$\frac{d}{dx}secx+tany=xy$
$11x-x$
$20.36+20.36+6.4+20+20+20+18+5+16.23+21.57+27.72+8.69+2+5+18+22+53$
$\sqrt[3]{64a^3k}$
$\frac{dy}{dx}=cx^3$
$-168+36\infty$
$\left(2x^{a+4}-y^{a-1}\right)^2$
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