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OpenStudy (anonymous):
verify that the equation is an identity ....
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OpenStudy (aakashsudhakar):
An equation would help?
OpenStudy (fibonaccichick666):
I'm willing to bet it's the same as this one http://openstudy.com/updates/547189f9e4b0db93229bfa24
OpenStudy (anonymous):
\[\sin 4\theta=4\cos2\theta \cos \theta \]
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