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Prove that:tan1tan11tan21tan69tan79tan89=1 |
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Answer» Step-by-step EXPLANATION: LHS = TAN 1° tan 11° tan 21° tan 69° tan 79° tan 89° = tan ( 90° - 1° ) tan ( 90° - 11°) tan ( 90° - 21° ) tan 69° tan 79° tan 89° = cot 89° cot 79° cot 69° tan 69° tan 79° tan 89° = 1 = RHS hence it's PROVED... |
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