$\frac{5x^4-3x^2+x+1}{x^2+2}$
$68\:-\:\left(21\:-\:54\right)\:+\:\left(7\:-\:72\right)$
$4\left(1+\sin\left(x\right)\right)=\cos\left(x\right)^2$
$3\cos^2x+cosx=0$
$x+4\ge1$
$\sqrt{\left(24\right)^2}-4+36$
$4x^2+8x$
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