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Sum

Express (sin 67° + cos 75°) in terms of trigonometric ratios of the angle between 0° and 45°**.**

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#### Solution

(sin 67° + cos 75°)

= (sin (90°−23°) + cos (90°−15°)) .....(∵ sin(90°−θ) = cosθ and cos(90°−θ) = sinθ)

= (cos 23°+ sin 15°)

Concept: Trigonometric Identities

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