SOLUTION: How to prove :sin theta * cos(90-theta) + cos theta * sin(90-theta)= 1

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Question 867458: How to prove :sin theta * cos(90-theta) + cos theta * sin(90-theta)= 1
Answer by solver91311(24713) About Me  (Show Source):
You can put this solution on YOUR website!


Hint:



and



Substitute and apply the Pythagorean Identity.

John

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