The number of solutions of `sum_(r=1)^6 cos(rx)=6` in

The number of solutions of sum_(r=1)^(5)cos rx=5 in the interval [0,2 pi] is 0( b) 2(c)5 (d) 10

Number of solutions of sum_(r = 1)^5 cos rx = 5 in the interval [0,4pi] is

Number of solutions of sum_(r=1)^(5)cos rx=5 in the interval [0,4 pi] is

sum_(r=1)^(6)6C_(r)

The number of solution of the equation Sigma_(r=1)^(5)cos(rx)=0 lying in (0, pi) is

The number of solution of the equation Sigma_(r=1)^(5)cos(rx)=0 lying in (0, pi) is

The number of solutions of the equation cos^(2) (x + (pi)/( 6)) + cos ^(2) x - 2 cos ( + (pi)/( 6)) co ""(pi)/( 6) = sin ^(2) (pi)/( 6) in interval ((-pi)/( 2), (pi)/( 2)) is _____

The number of solutions of the equation cos 6 x + tan^(2) x + cos 6 x tan ^(2) x = 1 , in the interval [0, 2 pi] is

The number of solutions of the equation cos^(2)(x+(pi)/(6))+cos^(2)x-2cos(x+(pi)/(6))*cos(pi)/(6)=sin^(2)(pi)/(6) in interval ((-pi)/(2),(pi)/(2)) is