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OpenStudy (anonymous):
how to simplify this equation? cos 70cos10 + sin70sin10
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OpenStudy (anonymous):
\(\cos(A - B) = \cos(A) \cos(B) + \sin(A) \sin(B) \)
OpenStudy (anonymous):
i still can`t get the answer.the answer is 1/2..
OpenStudy (anonymous):
cos 70cos10 + sin70sin10 fits somewhere in the above formula
OpenStudy (anonymous):
Cos(70-10) = cos(60) = 1/2
OpenStudy (anonymous):
ok,understand already..thanks
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OpenStudy (anonymous):
fantastick
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