Find the value of `(1+cos(pi/6))(1+cos(pi/3))(1+cos(( 2pi)/(3)))(1+cos ((7pi)/(6)) )is`

Find the value of 2cos^3(pi/7)-cos^2(pi/7)-cos(pi/7)

Find the value of |{:(cos((2pi)/(63)),,cos((3pi)/(70)),,cos((4pi)/(77))),(cos((pi)/(72)),,cos((2pi)/(80)),,cos((3pi)/(88))),(1,,cos((pi)/(90)),,cos((2pi)/(99))):}|

The value of cos^(-1)(cos (14pi)/(3)) is

Find the value of cos^2pi/(16)+cos^2(3pi)/(16)+cos^2(5pi)/(16)+cos^2(7pi)/(16)dot

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)

Find the value of cos(2pi)/7+cos(4pi)/7+cos(6pi)/7

The value of cos^(-1)(cos'(3pi)/(2)) is

Find the value of cos^2. pi/16+cos^2. (3pi)/16+cos^2. (5pi)/16+cos^2. (7pi)/16 .

cos^2(pi/8) +cos^2((3pi)/8) +cos^2((5pi)/8)+cos^2 ((7pi)/8)=2

Find the value of : sin{cos("cos"^(-1)(3pi)/4)}