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Mathematics, 22.02.2020 11:44 lilybear1700

2sin A /cos 3A + 2sin3A / cos 9A + 2 sin9A / cos27A = tan27A - tanA

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2sin A /cos 3A + 2sin3A / cos 9A + 2 sin9A / cos27A = tan27A - tanA...
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