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What is the largest value of "x" (in radians) less than pi satisfying the equation: cos x = cos (6x)

Mathematics
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is it the largest though?
http://www.wolframalpha.com/input/?i=graph+cos%28x%29%2C+cos%286x%29+from+0+to+pi

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Other answers:

it's the largest value of x, not the largest value of solution
right, I misunderstood
i'm getting x=4pi/5
\[\cos(x+2 \pi n)=\cos(6x) => x+2\pi n=6x\]
http://www.wolframalpha.com/input/?i=graph+cos%28x%29%2C+cos%286x%29+from+2.69+to+2.695
\[5x=2\pi n => x=\frac{2 \pi n}{5}\]
so if n=4 x
oops n=2
Myininaya is right
ok thank you
What's the Python solution to this problem? import sympy. sympy.solve(cos(x) = cos(6x))

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