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Express the terms of trigonometric ratios of angles lying between 0° and 45°. cosec 54° + sin 72°

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Express the terms of trigonometric ratios of angles lying between 0° and 45°.

cosec 54° + sin 72°

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cosec 54° + sin 72° 

= cosec (90 – 36)° + sin (90 – 18)° 

= sec 36° + cos 18°

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