The value of `cos[1/2cos^(-1)cos((14pi)/5)]i s` (a)`cos((2pi)/5)` (b) `cos(-(7pi)/5)` (c)`sin(pi/10)` (d) `-cos((3pi)/5)`

Which of the following is/are the value of "cos"[1/2cos^(-1)(cos(-(14pi)/5)]? cos(-(7pi)/5) (b) sin(pi/(10)) cos((2pi)/5) (d) -cos((3pi)/5)

The value of cos[(1)/(2)cos^(-1)(cos(-(14 pi)/(5)))] is/are a.cos (-(7 pi)/(5)) b.sin((pi)/(10))ccos((2 pi)/(5))d.-cos((3 pi)/(5))

cos^(-1)(cos(5 pi/(3))+sin^(-1)(cos(5 pi/(3))=

cos^(-1)((cos(7 pi))/(5)) is equal to

The value of cos(pi)/(5)cos.2(pi)/(5)cos4(pi)/(5)cos8(pi)/(5)=

The value of cos^(-1)("cos"(5pi)/3)+sin^(-1)("cos"(5pi)/3) is:

The value of cos ( pi //5) cos ( 2pi //5) cos ( 4pi //5) cos ( 8pi //5) is