sin(360--x)cos(180+x)cos(90+x)
=(-sinx)(-cosx)(-sinx)
=-sin^2xcosx
sin(360--x)cos(180+x)cos(90+x)
sin(360--x)cos(180+x)cos(90+x)
數(shù)學(xué)人氣:364 ℃時(shí)間:2020-03-22 20:43:25
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