Home
Class 11
MATHS
सिद्ध कीजिए की cos ""(2pi)/( 7)+ cos "...

सिद्ध कीजिए की
` cos ""(2pi)/( 7)+ cos ""( 4pi)/( 7)+cos ""( 6pi)/( 7)= -(1)/(2)`

Promotional Banner

Similar Questions

Explore conceptually related problems

The value of cos ""pi/7 cos ""(2pi)/(7) cos ""(3pi)/(7) is-

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

cos ((pi) / (7)) cos ((2 pi) / (7)) cos ((4 pi) / (7)) =

Prove that cos ((2pi)/7)+ cos ((4pi)/7) + cos ((6pi)/7) = - 1/2

Prove that cos ((2pi)/7)+ cos ((4pi)/7) + cos ((6pi)/7) = - 1/2

Prove that cos. (2pi)/(7). Cos. (4pi)/(7). Cos. (8pi)/(7)=(1)/(8)

cos (2 (pi) / (7)) cos (4 (pi) / (7)) * cos (6 (pi) / (7))

cos (pi/7) cos ((2pi)/(7) ) cos ( (4pi )/(7) ) =

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