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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