$\frac{cos\left(9x\right)-cos\left(3x\right)}{2sin\left(6x\right)}$
$4x+1\le9$
$\left(a-b\right)^2+\left(a+b-1\right)\cdot\left(a+b+1\right)$
$3^2+13x-2$
$x-.285x$
$\frac{2}{3}b-2\:\frac{3}{4}b$
$\frac{1}{1+\sec^2x}$
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