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Prove that following: (i) cos θ sin (90 - Ask TrueMaths!

Solution: (i) L.H.S. = cos θ sin (90° – θ) + sin θ cos (90° – θ). = cos θ x cos θ + sin θ x sin θ. = cos 2 θ + sin2 θ. = 1 = R.H.S..

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