" 8."4x^(2)-4x+1

Prove that sinfrac {pi}{14} is a root of the equation 8x^(3) -4x^(2) - 4x +1 = 0 .

Let a=(pi)/(7) , then (a) show that sin^(2)3a-sin^(2)a=sin2asin3a (b) show that co sec a=co sec 2a+co sec4a . (c) Prove that cos a is a root of the equation 8x^(3)+4x^(2)-4x+1=0 .

Let a=(pi)/(7) , then (a) show that sin^(2)3a-sin^(2)a=sin2asin3a (b) show that co sec a=co sec 2a+co sec4a . (c) Prove that cos a is a root of the equation 8x^(3)+4x^(2)-4x+1=0 .

Prove that the roots of the equation 8x^(3)-4x^(2)-4x+1=0 " are " cos""pi/7, cos""(3pi)/7 " and " cos""(5pi)/7 . Evaluate sec""pi/7+sec""(3pi)/7+sec""(5pi)/7

The roots of the equation 8x^(3)-4x^(2)-4x+1=0 " are " cos""pi/7, cos""(3pi)/7 " and " cos""(5pi)/7 . Evaluate sec""pi/7+sec""(3pi)/7+sec""(5pi)/7

let cos((pi)/(7)),cos((3 pi)/(7)),cos((5 pi)/(7)), the roots of equation 8x^(3)-4x^(2)-4x+1=0 then the value of sin((pi)/(14)),sin((3 pi)/(14)),sin((5 pi)/(14))

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

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

Prove that the roots of the equation 8x^(3)-4x^(2)-4x+1=0 " are " cos""pi/7, cos""(3pi)/7 " and " cos""(5pi)/7 . Evaluate sec""pi/7+sec""(3pi)/7+sec""(5pi)/7

let cos(pi/7),cos((3pi)/7),cos((5pi)/7), the roots of equation 8x^3 - 4x^2 - 4x +1=0 then the value of sin(pi/14),sin((3pi)/14),sin((5pi)/14)