SOLUTION: the expression sin2A - 2sinA is equivalent to:

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Question 856798: the expression sin2A - 2sinA is equivalent to:

Answer by harpazo(655) About Me  (Show Source):
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Note: sin2A = 2sinAcosA
Then 2sinAcosA - 2sinA.
Factor out 2sinA.
Answer: 2sinA(cosA - 1)