" The value of "tan{(cos^(-1)(-(2)/(7))-(pi)/(2))}" is: "

The value of cos[2tan^(-1)(-7)] is

The value of cos[2 tan^(-1)(-7)] is

Find the value of tan^(-1)(2"cos"(pi)/(3))

the value of (cos pi)/(7)cos(2(pi)/(7))cos(3(pi)/(7)) is

Find the value of 2cos^(3)((pi)/(7))-cos^(2)((pi)/(7))-cos((pi)/(7))

The value of cos((2pi)/7)cos((4pi)/7)cos((6pi)/7) is

The value of cos{pi + tan^-1(-1/2)} is

The value of cos((2pi)/7)cos((4pi)/7)cos((6pi)/7) is a. -1//2 b. \ 1//2 c. \ 1//4 d. 1//8

If the value of cos((2 pi)/(7))+cos((4 pi)/(7))+cos((6 pi)/(7))+cos((7(pi)/(7)))=-(l)/(2) Find the value of l