[" 4.The value of "cos(pi)/(2^(2))*cos(pi)/(2^(3))*......cos(pi)/(2^(10))*sin(pi)/(2^(10))],[" is : "]

the value of cos((pi)/(2^2)) cos((pi)/(2^3)) cos((pi)/(2^4)) ..... cos((pi)/(2^(10))) sin((pi)/(2^(10))) is (a) (1)/(1024) (b) (1)/(512) (c) (1)/(256) (d) (1)/(128)

the value of (cos(pi))/(2^(2)),(cos(pi))/(2^(3)),(cos(pi))/(2^(4))*(cos(pi))/(2^(10))(sin(pi))/(2(10)) is (a) (1)/(1024) (b) (1)/(512) (c) (1)/(256) (d) (1)/(128)

the value of cos((pi)/(2^2)) . cos((pi)/(2^3)) . cos((pi)/(2^4)) ....... cos((pi)/(2^(10))) sin((pi)/(2^(10))) is

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^(-1){(1)/(sqrt(2))(cos((9 pi)/(10))-sin((9 pi)/(10)))}

The value of cos^(2)((pi)/(20))+cos^(2)((2 pi)/(20))+cos^(2)((3 pi)/(4))+......+cos^(2)((9 pi)/(20)) is

The value of (cos"" (pi)/(2)+isin ""(pi)/(2))(cos ((pi)/(2^2))+isin((pi)/(2^2))) (cos ((pi)/(2^3))+isin((pi)/(2^3)))" ………."oo is

The value of 4cos((pi)/(10))-3sec((pi)/(10))-2tan((pi)/(10))is equal to

The value of cos^(-1){1/(sqrt(2))("cos"(9pi)/10-"sin"(9pi)/10)} is