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Mathematics, 01.09.2019 19:50 jiiaxuan2035

Prove that sina-sin3a+sin5a-sin7a/cosa-cos3a-c os5a+cos7a= cot2a

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Prove that sina-sin3a+sin5a-sin7a/cosa-cos3a-c os5a+cos7a= cot2a...
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