$\int\frac{sin3x}{cos^23x}dx$
$\frac{\left(\left(-1\right)^k\right)}{2k+1}2\cdot3^{\left(2k+1\right)}$
$2m-7\ge5-m$
$5x^2-10x+2=0$
$3\sin\left(2x\right)+3\sin\left(x\right)=0$
$x^2+2xy-y-x\frac{dy}{dx}$
$\lim_{x\to\infty}\left(\frac{7x^2}{e^{9x}}\right)$
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