Evaluating at Period

Level pending

If the period of the function f ( x ) = 8 + cos x + 10 cos x f(x)=\sqrt{8+\cos x}+\sqrt{10-\cos x} is a , a, what is the value of f ( a ) ? f(a)?

8 9 6 7

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1 solution

Ignacio Victoria
Feb 26, 2014

f(A)=(8+cosA)^-2+(10-cosA)^-2=(2(2)^-2)+((10)^-2)=5.99070 which can be approximated as 6

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