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Which of the following are defined for a...

Which of the following are defined for all x ?

A

`sin [x]+ cos [x]` ( `[x]` denotes greatest integer `le x` )

B

`sec^(-1) (1 + sin^(2)x)`

C

`tan(log x)`

D

`sqrt(9/8 + cos x + cos 2 x)`

Text Solution

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The correct Answer is:
A, B, D
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