The exact value of `cos((2pi)/28)cosec((3pi)/28)+cos((6pi)/28)cosec((9pi)/28)+cos((18pi)/28)cosec((27pi)/28)`

The value of cos(pi/7)+cos((2pi)/7)+cos((3pi)/7)+cos((4pi)/7)+cos((5pi)/7) +cos((6pi)/7)+cos((7pi)/7) is

The value of cos""(pi)/(9)cos""(2pi)/(9)cos""(3pi)/(9)cos""(4pi)/(9), is

The value of csc(pi)/(18)-4sin(7 pi)/(18) is

The value of cosec(pi/18)-sqrt3sec(pi/18) is a

The value of cosec(pi/18)-sqrt3sec(pi/18) is a

The vlaue of cosec^(2)""(pi)/(7)+cosec^(2)""(2pi)/(7)+cosec^(2)""(3pi)/(7), is

The value of cos^(2)0+sin^(2)((pi)/(6))+tan^(2)((pi)/(3))+cosec^(2)((pi)/(2)) is

2sin^(2)(pi/6)+cosec((7 pi)/6)cos^(2)(pi/3)=?

The value of cos""(pi)/(7)+cos""(2pi)/(7)cos""(3pi)/(7)+cos""(4pi)/(7)+cos""(5pi)/(7)+cos""(6pi)/(7)+cos""(7pi)/(7) is