Question

thitt=*
the value of cos 1degree cos 2degree.........................cos 100degree is

Answer 1

thitta=*\[\theta\]

Answer 2

1 + 2cos x + 2 cos 2x + 2 cos 3x +....+ 2 cos nx =sin((n+(1/2))x) / sin(x/2)

Answer 3

it is zero since cos90=0 and cos 90 appears in the series