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OpenStudy (anonymous):
Rewrite 1 − 2 sin^2 22.5° using a double-angle identity.
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OpenStudy (anonymous):
that is the double angle formula for cosine
OpenStudy (anonymous):
it is the cosine of whatever \(2\times 22.5\) is
OpenStudy (anonymous):
I'm glad you are not a qualified helper they are jerks
OpenStudy (anonymous):
lol
OpenStudy (anonymous):
so It is cos 45
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OpenStudy (anonymous):
yes
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