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OpenStudy (anonymous):
sin 4a = 4sin a cos a cos 2 a verify the two above are equal- use identities.
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OpenStudy (anonymous):
u know sin2a = sina.cosa + cosa.sina
OpenStudy (anonymous):
i mean 2sina.cosa
OpenStudy (anonymous):
same thing...^^^
OpenStudy (anonymous):
\[\sin2a = 2sina \times cosa\] Apply this formula above in sin4a.. see you can write sin4a as sin2(2a)..
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