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प्रश्न
Express each of the following in terms of trigonometric ratios of angles between 0° and 45°: cos84° + cosec69° - cot68°
उत्तर
cos84° + cosec69° - cot68°
= cos(90° - 6°) + cosec(90° - 21°) - cot(90°- 22°)
= sin6° + sec21° - tan22°.
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