$\:4n\:+\:3n\:2-\:6n\:2-\:7\:+\:4n$
$\int\left(sin\left(105x\right)sin\left(45x\right)\right)dx$
$1^2+\left(4-2\cdot\left(2\right)\right)$
$\frac{sin\left(x\right)}{cos\left(x\right)}=\frac{-1}{4}$
$6cos^23x-7cos3x-3=0$
$\lim_{x\to1}\left(\frac{x^2-2x+1}{x^3-3}\right)$
$x^2y'+xy+1=0$
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