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ããcos(arcsinx)=âï¼1-x^2ï¼
ããarcsin(-x)=-arcsinx
ããarccos(-x)=Ï-arccosx
ããarctan(-x)=-arctanx
ããarccot(-x)=Ï-arccotx
ããarcsinx+arccosx=Ï/2=arctanx+arccotx
ããsin(arcsinx)=cos(arccosx)=tan(arctanx)=cot(arccotx)=x
ããå½ xâ[-Ï/2ï¼Ï/2] æarcsin(sinx)=x
ããxâ[0ï¼Ï]ï¼ arccos(cosx)=x
ããxâ(-Ï/2ï¼Ï/2)ï¼ arctan(tanx)=x
ããxâ(0ï¼Ï)ï¼ arccot(cotx)=x
ããx>0ï¼arctanx=Ï/2-arctan1/xï¼arccotx类似
ããè¥ (arctanx+arctany)â(-Ï/2ï¼Ï/2)ï¼å arctanx+arctany=arctan((x+y)/(1-xy))
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