`Arg {sin 8pi/5 +i( 1+ cos 8pi/5)}` is equal to:

Arg{sin8(pi)/(5)+i(1+cos8(pi)/(5))} is equal to:

cos^(-1) (cos 8pi/5)

The value of cos(pi)/(8)cos(3 pi)/(8)cos(5 pi)/(8)cos(7 pi)/(8) is equal to

cos""(pi)/(15).cos""(2pi)/(15).cos""(4pi)/(15).cos""(8pi)/(15) is equal to

Covert the complex number z = 1 + cos (8pi)/(5) + i. sin (8pi)/(5) in polar form. Find its modulus and argument.

Covert the complex number z = 1 + cos (8pi)/(5) + i. sin (8pi)/(5) in polar form. Find its modulus and argument.