Final Answer
$\left(\sin\left(a\right)-1\right)^2$
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Step-by-step Solution
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1
When multiplying two powers that have the same base ($\sin\left(a\right)-1$), you can add the exponents
$\left(\sin\left(a\right)-1\right)^2$
Final Answer
$\left(\sin\left(a\right)-1\right)^2$