Cos2Acos3A—cos2Acos7A+cosAcos10A =cot6Acot5A Sin4ASin3A—sin2Asin5A+sin4A+sin7A

Cos2Acos3A—cos2Acos7A+cosAcos10A =cot6Acot5A Sin4ASin3A—sin2Asin5A+sin4A+sin7A
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