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in Mathematics by (60.8k points)

If sum of all the solutions of the equation 8cosx.(cos(π/6+x).cos(π/6-x)-1/2)=1 in [0,π] is kπ, then k is equal to:

(1) 2/3  (2) 13/9  (3) 8/9  (4) 20/9

by (10 points)
But the question said that x lies between [0,pi] then why did you consider 420 degrees

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by (10 points)
But the question said that x lies between [0,pi] then why did you consider 420 degrees

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