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Prove that:(i) tan 5º tan 25º tan 30° tan 65° tan 85º =1 by under root 3 |
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Answer» Step-by-step explanation: [using IDENTITY tanx = cot(90 - x)] =tan5 tan25 cot(90 - 25) cot(90 -5) tan30 =tan5 tan25 cot25 cot5 tan30 [using identity (tanx x cotx =1)] =1 x 1 x tan30 =tan30 =1/root 3 |
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