$\cos\left(x\right)^2+1+\sin\left(x\right)^2\cos\left(x\right)^2=1$
$\left(k-1\right)\left(k+5\right)$
$\frac{9-x^2}{x+2}$
$9\left(-2c\right)\left(3d\right)$
$\left(12\right)^2+\left(12t^{\frac{1}{2}}\right)^2+\left(6t\right)^2$
$a+b=25$
$\frac{2x+1}{3x-6}\ge3$
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