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Which of the following is/are the value ...

Which of the following is/are the value of `cos[1/2cos^(-1)(cos(-(14pi)/5))]?`

A

`cos(-(7pi)/5)`

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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