# Cos 2 Pi 7 Cos 4 Pi 7 Cos 8 Pi 7

Cos 2 Pi 7 Cos 4 Pi 7 Cos 8 Pi 7. See all questions in Trigonometric Functions of Any Angle. cos(π). This video is basically prepared for SEE students for the subject optional maths.

I would be very grateful to any. cos(arcsinx) as an algebraic expression, cosine of inverse sine x. The video may have some weakness. See all questions in Trigonometric Functions of Any Angle. cos(π).

### See all questions in Trigonometric Functions of Any Angle. cos(π).

I would be very grateful to any. cos(arcsinx) as an algebraic expression, cosine of inverse sine x.

If A=sin((2pi)/7)+sin((4pi)/7)+sin((8pi)/7) and B=cos …