SOLUTION: (1) Why is (cosx-sinx)^2 = to 1-2sinxcosx? That's the answer the prof. gave but I don't get that :/

SOLUTION: (1) Why is (cosx-sinx)^2 = to 1-2sinxcosx? That's the answer the prof. gave but I don't get that :/

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Question 978214: (1) Why is (cosx-sinx)^2 = to 1-2sinxcosx?
That's the answer the prof. gave but I don't get that :/

Answer by josgarithmetic(39631) (Show Source): You can put this solution on YOUR website!

Most basic of trigonometric identities,

DONE
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