SOLUTION: (cos theta +1)(cos theta -1) I cannot figer this out help me

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Question 615389: (cos theta +1)(cos theta -1)
I cannot figer this out help me
Answer by asuar010(338) About Me  (Show Source):
You can put this solution on YOUR website!
that becomes cos^2 -1 and if we substitute cos^2 by the identity of (1-sin^2) we get (1-sin^2)-1 which is teh same as sin^2 as the final answer