$\left(3x+4y+5z\right)^2$
$x^2-5x-66$
$\lim_{x\to0}x^2+x-6$
$\int_0^{\pi}\left(\left(1-\cos\left(x\right)\right)\sin\left(x\right)\right)dx$
$a^2-19a+100$
$\lim\:_{x\to\:\infty\:}\left(\frac{1}{x^2}\right)^{\frac{x}{2x^2+1}}$
$1-\sin^2x-3\sin^2x=0$
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