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) (Show Source): You can put this solution on YOUR website!
Note: sin2A = 2sinAcosA
Then 2sinAcosA - 2sinA.
Factor out 2sinA.
Answer: 2sinA(cosA - 1)
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