$\frac{cos\left(a+b\right)}{cos\left(a\right)+cos\left(b\right)}$
$8b-64$
$\frac{x\left(9x+11\right)}{3z+2}+1$
$5x^2-9+46$
$x^0y^{-3}$
$2\sin^2x+\sqrt{3}\sin\left(x\right)=0$
$\sqrt[2]{4+\sqrt{15}}\cdot\sqrt{4-\sqrt{15}}$
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