The value of `sec(pi/7)*sec(2pi/7)*sec(3pi/7)` is

If cos(pi/7), cos((3pi)/7), cos((5pi)/7) are the roots of the equation 8x^3-4x^2-4x+1=0 The value of sec(pi/7)+sec((3pi)/7)+sec((5pi)/7) is

the value of sin(pi/7)+sin((2pi)/7)+sin((3pi)/7) is

The value of sec^(-1)(sec(8pi)/5) is

If 7 theta = (2n +1) pi, where n = 0 , 1, 2, 3, 4,5, 6 then on the basis of above information, answer the following questions The value of sec pi//7 + sec 3pi//7 +sec 5pi//7 is

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/7)+cos((2pi)/7)+cos((3pi)/7)+cos((4pi)/7)+cos((5pi)/7)+cos((6pi)/7)+cos((7pi)/7) is 1 (b) -1 (c) 0 (d) none of these

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 1 (b) -1 (c) 0 (d) none of these

Let cos(pi)/(7),cos(3 pi)/(7),cos(5 pi)/(7) are the roots of equation 8x^(3)-4x^(2)-4x+1=0 Q.The value of sec((pi)/(7))+sec((3 pi)/(7))+sec((5 pi)/(7)) is