# SOLUTION: Perform the multiplication and use fundamental identities to simplify: (sin x + cos x)^2

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 Question 105526This question is from textbook Precalculus with limits : Perform the multiplication and use fundamental identities to simplify: (sin x + cos x)^2This question is from textbook Precalculus with limits Answer by Fombitz(13828)   (Show Source): You can put this solution on YOUR website!(sin x + cos x)^2 Using the FOIL Method, FOIL method. You know the following trig identity, Substitute that in your equation, Another indentity (fundamental identity, I think) is, Substitute that into your equation,