Q. 45.0( 1 Vote )

# If then write the value of in the simplest form.

Given,

To find the value of

[using the formula cos 2x = 2cos2 x – 1]

[using the formula cos 2x = 2cos2 x –1, here 2x = θ so x = ]

As given, now by dividing the whole inequation with 2 we get, .

This clearly state that lies in the 1st quadrant and between 45° and 90°.

So

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