SOLUTION: verify idenity (cos^4x � sin^4x)/(cosx + sinx) = cos x � sin x

Question 433311: verify idenity
(cos^4x � sin^4x)/(cosx + sinx) = cos x � sin x

Answer by belle3833(46) (Show Source): You can put this solution on YOUR website!

using difference of 2 squares
=
using difference of 2 squares again
=
cancelling out:
=
(identity)
so
=cosx-sinx
hope this helps
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