sinx×cos(β-x)是哪个函数的导数
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∫sinx·cos(β-x)dx
=∫[sinx(cosβcosx+sinβsinx)]dx
=∫(cosβsinxcosx+sinβsin²x)dx
=cosβ∫½sin2xdx+sinβ∫sin²xdx
=-¼cosβcos2x+sinβ∫(1-cos2x)/2dx
=-¼cosβcos2x+sinβ∫½dx-½∫cos2xdx
=-cosβcos2x/4+sinβ·x/2-sinβ·sin2x/4+C
=sinβ·x/2-cos(β-2x)/4+C
=∫[sinx(cosβcosx+sinβsinx)]dx
=∫(cosβsinxcosx+sinβsin²x)dx
=cosβ∫½sin2xdx+sinβ∫sin²xdx
=-¼cosβcos2x+sinβ∫(1-cos2x)/2dx
=-¼cosβcos2x+sinβ∫½dx-½∫cos2xdx
=-cosβcos2x/4+sinβ·x/2-sinβ·sin2x/4+C
=sinβ·x/2-cos(β-2x)/4+C
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