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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. `s in(pi/(10))` c.`cos((2pi)/5)\ ` d. `-cos((3pi)/5)`

A

`cos (-(7pi)/(2))`

B

`sin(pi/10)`

C

`cos((2pi)/(5))`

D

`-cos ((3pi)/(5))`

Text Solution

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The correct Answer is:
B, C, D
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