$7^8$
$10\sqrt{x+y}=\:-\sqrt{y+x}$
$\lim_{x\to0}\left(2x^2+1\right)^x$
$2x^2y-6xy^2-8x^2y^2$
$\left(3a^n+2b^{n+1}\right)^2$
$\int2xe^{-5x}dx$
$\int\frac{2x^3+5x^2+16x}{\left(x^2+4\right)^2}dx$
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