Example 11 - Express cot 85 + cos 75 in terms of ratios - Trignometric ratios of complementry angles

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Example 11 Express cot 85° + cos 75° in terms of trigonometric ratios of angles between 0° and 45°. cot 85° + cos75° = cot (90° − 5) + cos (90° − 15°) = tan 5° + sin 15° Hence required value is tan 5° + sin 15°

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