$\left(x+y-2\right)dx\:+\:\left(x-y+4\right)dy=0$
$\cos^2x+2\cos x+1$
$\left(4-8a\right)^2$
$y=\cos\left(\frac{1}{2x^{2}}+\frac{5}{x^{3}}+\frac{3}{x^{4}}\right)$
$-a-b-b-a$
$3\cdot\left(x^2-3x\right)+5x$
$\int\frac{4x^3+2x+1}{\left(4x^3-x\right)}dx$
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