$x^4-x^2+1$
$\lim_{x\to0}\left(\frac{2x^2}{x+1}\right)$
$\int_0^{\pi}\left(6cosxsinx\right)dx$
$-10-[+5-\left(20-14\right)-7]-6+12+\left(-2$
$\left(2.97\right)^6$
$\cos^2x-4\cos x+3=0$
$\frac { ( x + 2 ) ^ { 3 } } { x + 2 }$
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