$cos\left(x\right)\cdot cos\left(2x\right)=\frac{sin\left(4x\right)}{4}$
$24-5\cdot6$
$\left(3^{2+8b^3}\right)^2$
$\frac{7}{t-1}-\frac{14}{t^2-1}$
$\left(-x\right)\left(3x^4\right)$
$y'e^{x+y}$
$x^2-49+45$
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