SOLUTION: prove that: 2 sin^2(45-A)=1-sin2A

Question 1140881: prove that:
2 sin^2(45-A)=1-sin2A
Answer by MathLover1(20849) (Show Source): You can put this solution on YOUR website!

Manipulating left side:

since , we have

=...simplify, factor out
=...simplify, factor out

=

=

=.......expand

=.........use identity
= .......use identity

=

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