$2x\:+5\:-\:0.75x\:+\:2$
$\left(cosx-sinx\right)^2=1-sin2x$
$\lim_{x\to\infty}\left(e^{-2x}\cos\left(x\right)\right)$
$3\:x^2\:+30\:x\:+75=3x\:2\:+30x+75$
$\int e^{4x+3}dx$
$\left(137x-5x^2-6x^3\right)y$
$\frac{2}{x\left(x+9\right)}$
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