`cos(x+pi/10)=0`

If m and M be the minimum and maximum value of f(x)=cos((pi)/(10)+x)-cos((pi)/(10)-x)-cos((3 pi)/(10)+x)+cos((3 pi)/(10)-x) then

|[1,(3 pi)/(10),(2 pi)/(10)],[0,cos(3 pi)/(10),sin(2 pi)/(10)],[0,sin(3 pi)/(10),cos(2 pi)/(10)]|

The value of cos((pi)/(10))cos((2 pi)/(10))cos((4 pi)/(10))cos((8 pi)/(10))cos((16 pi)/(10))

The value of (cos(pi/10)+isin(pi/10))(cos((2pi)/10)+isin((2pi)/10))(cos((3pi)/10)+isin((3pi)/10))(cos((4pi)/10)+isin((4pi)/10)) is

Find the value of ((1 + sin"" (pi)/(10) + i cos"" (pi)/(10))/(1 + sin"" (pi)/(10) - i cos"" (pi)/(10)))^(10) .

Prove that cos x+cos((2 pi)/(3)-x)+cos((2 pi)/(3)+x)=0