$\frac{\cos\left(x+y\right)}{\cos\left(x\right)\cos\left(y\right)}$
$n\sqrt{9b}$
$1+\frac{\csc\left(x\right)}{\sec\left(x\right)}-\cot\left(x\right)=\cos\left(x\right)$
$5n^5+9n+6n-2n^5$
$\left(ae2-10\right)^2$
$6.1\cdot10^5$
$\left(\left(-15\right)\cdot4-3\right)$
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