PreCal
posted by Hannah .
1) Verify the identity
cos^2 B  sin^2 B = 2 cos^2 B 1
I know that cos^2 B  sin^2 B = 2 cos^2 B 1 by the double angle formula but I do not know how to show this.

LS =
cos^2 B  sin^2 B
= cos^2 B  (1  cos^2 B)
= 2cos^2 B  1
= RS
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