Applying the cosecant identity: $\displaystyle\csc\left(\theta\right)=\frac{1}{\sin\left(\theta\right)}$
The power of a quotient is equal to the quotient of the power of the numerator and denominator: $\displaystyle\left(\frac{a}{b}\right)^n=\frac{a^n}{b^n}$
Multiplying the fraction by $-\sin\left(x\right)^2$
Simplify the fraction $\frac{-\sin\left(x\right)^2}{\sin\left(x\right)^2}$ by $\sin\left(x\right)^2$
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