Question 601506
If f(x)= cos x and f(a)= -1/12 
find the exact value of f(a) + f(a-2pi) + f(a+4pi)
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Equation:
exact value of f(a) + f(a-2pi) + f(a+4pi)
(-1/12) + (-1/12) + (-1/12)
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= -3/12
= -1/4
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Cheers,
Stan H.