Q7 of 58 Page 8

Find the value of the expression

Given:


⇒


⇒


(∵cos(90°-θ) = sin θ and sin(90°-θ) = cos θ)


⇒


⇒ 1/1 + 1 = 2


(Since, as by identity, sin2 θ +cos2 θ =1


So, and sin2 63° + cos2 63° = 1 )


∴


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