I) If 8cosx cos2 x cos4x=(sin6x)/(sinx) ...

I) If `8cosx cos2 x cos4x=(sin6x)/(sinx)` has a solution then `cos7x=0` II) If `cos (alpha/2)+sin(alpha/2)=sqrt2(cos36^@-sin18^@)` then genral solution for `alpha/2-pi/4=2npi +- pi/3, n in I` III) The number of solution of `cos theta + sqrt3 sin theta=5, 0 le theta le theta le5pi` is `4.` Which of the above statement is correct ?

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