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The numerical value of cot 18^(@) (co...

The numerical value of
`cot 18^(@) (cot 72^(@) cos^(2) 22^(@) + (1)/(tan 72^(@) sec^(2) 68^(@)))` is

A

1

B

`sqrt(2)`

C

3

D

`(1)/(sqrt(3))`

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The correct Answer is:
A
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KIRAN PUBLICATION-TRIGONOMETRY -TYPE - II
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