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

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

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