$\sin\:-sin\left(2x\right)=\frac{-2cot\left(x\right)}{1+cot^2\left(x\right)}$
$-18.1-1.309$
$x+\sqrt{x}-14=0$
$\left(5xy^2\right)\left(x^4y^3-3x^5y^4\right)$
$\frac { ( 3 ) ( 5 ) ( 8 ) } { ( 3 ) ( 4 ) }$
$x^2-8x=-1$
$-l^2+8l^2$
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