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OpenStudy (anonymous):
lim (sin a + sin 5a) / (cos a + cos 5a) a-> pi/4
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OpenStudy (alfie):
Are you allowed to use derivatives?
OpenStudy (anonymous):
I think so .
OpenStudy (alfie):
I can't think of any solution given by multiplying and dividing a quantity. I would use de L'Hopital. Try that way.
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