$\sec x\:\cos x+\frac{1-\cos x^2}{1-\sin x^2}$
$14-16+8+12+8+6$
$6x\left(6x-y\right)-2$
$3-\csc^2\left(\frac{\frac{\pi}{4}}{2}\right)$
$81x^2-\left(a-3x\right)^2$
$3\left(b+4\right)=6$
$\frac{3}{9x^3}$
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