Sin 20 - 2 Cos ² 28 - 2 Cos 62 - Sin 70
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Step-by-step explanation:
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Answer:
sin 20°. cos 28 °+cos 62.sin 70
sin 28°.cis(62°-28°) + cos 28°sin (62°-28°) sin 62°.cos 62° +sin 62°. cos 62°
sin 2 62 +cos 70
= 1 LHS
Step-by-step explanation:
sin° +cos = 1
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