$2^32^42^6$
$4\left(3\right)^4-8\left(3\right)^3+14\left(3\right)^2+8\left(3\right)-15\:\:\:\:\:\:\:$
$\frac{1-x-2}{3-x\cdot\left(1-\sqrt{x-2}\right)}$
$\cos^2x\:+1=2$
$x^2+3x=1n$
$\frac{d^2}{dx^2}\left(sinx+cotx\right)$
$\sec x\left(1+\cot x\right)=\sec x+\cos x$
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