Q. 25.0( 4 Votes )

If θ = 45°, find the value of

(i)

(ii) cos2 θ - sin2 θ

Answer :

(i)


Given θ =45°


We know that,


tan(45o) = 1




= 1+ 2


= 3


(ii) cos2 θ – sin2 θ


Given θ = 45°




So, cos2 45° – sin2 45°



= 0


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