Q. 17

Mark the Correct alternative in the following:

If then general value of θ is

A.

B.

C.

D.

Answer :

3cos2x=(√2 - sin x)2


3 - 3sin2x=2 +sin2x – 2√2sin x


4 sin2x – 2√2sin x -1 = 0



So, x=15° or 345°


And these values are obtained by the following equation



Option D

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