cos 3a ka formula（関連順）

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sin 3a ,cos 3a ka formula सात जन्म तक भी नहीं भूलोगे जबरदस्त ट्रिक

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cos(2A)cos(3A)−cos(2A)cos(7A)sin(4A)sin(3A)−sin(2A)sin(5A)=sin(7A)+sin(3A)sinA

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結果 : cos 3a ka formula