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§和角公式

... ( 1時,t2 ( 3為最大值,此時t (為最大值 即cosx ( cosy的最大值為 主題2:倍角 ... 【詳解】sin 2 A ( sin 2 B ( sin 2 C ( 2 ( ((( 2 ( ((cos2A ( cos2B ( cos2C) ( 2 ( cos2A ( cos2B ( cos2C ( ( 1 ( 2cos(A ( B) cos(A ( B) ( cos[2( ( (A ( B))] ( ( 1 ( 2cos(A ( B) cos ......

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