The value oif the expressin `(1+cospi/10)(1+cos(3pi)/10)(1+cos(7pi)/10)(1+cos(9pi)/10)` is

The value of (1+cospi/8)(1+cos(3pi)/8)(1+cos(5pi)/8)(1+cos(7pi)/8)i s (a)1/4 (b) 3/4 (c) 1/8 (d) 3/8

Find the value of following expression: [(1-cospi/(10)+isinpi/(10))/(1-cospi/(10)-isinpi/(10))]^(10)

Find the value of following expression: [(1-cospi/(10)+isinpi/(10))/(1-cospi/(10)-isinpi/(10))]^(10)

2cos(pi/13)cos(9pi/13)+cos(3pi/13)+cos(5pi/13)=0

The expression 2"cos"(pi)/(17)*"cos"(9pi)/(17)+"cos"(7pi)/(17)+"cos"(9pi)/(17) simplifies to an integer P. Find the value of P.

The value of the expression sin^(-1)(sin(22pi)/7)cos^(-1)(cos(5pi)/3)+tan^(-1)(tan(5pi)/7)+sin^(-1)(cos2) is (17pi)/(42)-2 (b) -2 (-pi)/(21)-2 (d) non eoft h e s e

The value of cos""(pi)/(11)+cos""(3pi)/(11)+cos""(5pi)/(11)+cos""(7pi)/(11)+cos""(9pi)/(11), is

Prove that: 2cos pi/(13) cos (9pi)/(13) +cos (3pi)/(13) +cos (5pi)/(13)=0

Solve cos^6(pi/16)+cos^6((3pi)/16)+cos^6((5pi)/16)+cos^6((7pi)/16)

Prove that: (1+cos. (pi)/8)(1+cos. (3pi)/8)(1+cos. (5pi)/8)(1+cos. (7pi)/8)=1/8