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When, determine the value of .

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answer is A.

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Detailed Solution

Concept: By squaring both sides of

and then inserting the value of

wherever it is needed, one can use the identity

.
Given,

and

In order to find

, square both sides of equation

On putting value from eq. (ii), we have
Question Image

Considering that,

The Answer is

Hence, option 1 is correct.

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