Express the following in terms of the trigonometric ratios of angles between 0° and 45°.
(i) sin 81° + sin 71°
(ii) tan 68° + sec 68°
(i) sin (90˚ – 9˚) + sin (90˚ – 19˚)
⇒ cos 9˚ + cos 19˚
(ii) tan (90˚ – 22˚) + sec (90˚ – 22˚)
⇒ cot 22˚ + cosec 22˚
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