SOLUTION: if y=sin x + cos x prove that: (y')^2 +y=2

SOLUTION: if y=sin x + cos x prove that: (y')^2 +y=2

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Question 1125384: if y=sin x + cos x
prove that:
(y')^2 +y=2

Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
if y=sin x + cos x
prove that:
(y')^2 +y=2
-----------
Step 1, find y'
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