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Health, 31.07.2020 08:01 ayoismeisalex
Prove that 2sin A/cos 3A + 2 sin3A/cos 9A +2sin9A/cos27A = tan 27A-tanA
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Prove that 2sin A/cos 3A + 2 sin3A/cos 9A +2sin9A/cos27A = tan 27A-tanA...
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