$\frac{4.5}{2.5}=1.8$
$\left(2a-y\right).\left(2a+1\right)$
$\frac{d}{dx}2\sqrt{3-x^2}$
$100x^6+16+80x^3$
$\left(e^t-1\right)^2$
$-7y+9-4y$
$2csc\:x=\frac{sin\:x}{1-cos\:x}+\frac{sin\:x}{1+cos\:x}$
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