$\left(-5\right)\left(-5\right)+13$
$y'=\left(x+y\right)ln\left(x+y\right)-1$
$\int3xe^{x^2+1}dx$
$49\:x^4\:-\:144\:y^6$
$2^5.\:7^5$
$\frac{\sec\:^2\left(u\right)}{\csc\:^2\left(u\right)}$
$\frac{dy}{dx}=\frac{-2xy}{x^2+y^2}$
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