$\frac{dy}{dx}=\frac{5ylny}{x}$
$\:x\:-\:5\:>\:9\:-\:x$
$2b^2+5b-3=0$
$12.319-2715$
$\frac{1+\csc\left(a\right)}{\sec\left(a\right)}=\cos\left(a\right)+\cot\left(a\right)$
$\int\frac{4}{x\sqrt{1-x^2}}dx$
$-4x^2-9x^3-13x^2+3x^2;\:x=7;\:x=2$
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