$x^4-25=0$
$x^2+2xy-36+y^2$
$x^2-2x+16$
$\int_0^{\pi\:}e^{-\frac{t}{2}}cos\left(2nt\right)\:dt$
$\left(+8\right)-\left(-2\right)$
$\lim_{x\to-1}\left(\frac{\left(x^2+2x+1\right)}{\left(x^2-1\right)}\right)$
$2cos^22x-7cos2x+3=0$
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