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Question

cos(i5x)=?


A

icoshx

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B

icoshx

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C

coshx

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D

coshx

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Solution

The correct option is C

coshx


Explanation for the correct option:

Given, cos(i5x)

=cos(ix) ; i=-1

=coshx ; cos(ix)=coshx

Hence, Option ‘C’ is Option.


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