Asked by Anonymous
Verify the identity.
(Cos x - sin x)^2 + (cos x + sin x)^2=2
(Cos x - sin x)^2 + (cos x + sin x)^2=2
Answers
Answered by
bobpursley
C^2-2SC+S^2 + C^2+2SC+S^2=
2(C^2+S^2)=
2
2(C^2+S^2)=
2
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