$1+2+3+4+5+6+7+8+9+10+11+12+13+14+15$
$\int\frac{sec4x}{cot4x}dx$
$a^9-a^7+a^4+a^3$
$\frac{dy}{dx}=\frac{-y\left(1+x\right)}{x}$
$81-10d+d^2$
$\left(\frac{x^3}{5}\right)^2$
$2x^2+4x+2=4x^2+2x$
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