±È½Ï´óС:sin1,cos1(ÒªÓнâ´ð¹ý³Ì)

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sinxcosx µÈÓÚ

sinxcosx=(1/2)sin2x Óɱ¶½Ç¹«Ê½£ºsin2x=2sinxcosx µÃ£ºsinxcosx=(1/2)sin2x


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