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The value of cos[1/2cos^(-1)cos((14pi)/...

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)`

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

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