$( x ^ { 4 } - 4 y - c ^ { 2 } ) ^ { 2 }$
$2x-3\le1$
$x^3-2x+1=1$
$\lim_{x\to\frac{\pi}{2}}\left(\frac{3sec\left(x\right)+5}{tan\left(x\right)}\right)$
$-16-4\cdot4$
$\frac{x^4+31x^2-5x^3-8x+21}{x^2-2x-7}$
$\frac{1-\cos^2\left(x\right)}{1-\sin^2\left(x\right)}$
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