sin(arccos1/2)
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sin(arccos1/2)
sin(arccos1/2)
sin(arccos1/2)
二分之根号三
因为arccos1/2=60
sin60=(sqrt3)/2
arccos1/2=π/3
sin(arccos1/2)
=sin(π/3)=(根号3)/2
sin(arccos1/2+arccos1/3)
sin(arccos1/2)
sin(arcsin1/2+arccos1/3)?
求值:sin(2arcsin1/3+arccos1/5)
sin(2arcsin1/3arccos1/5)
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