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y=sin(x+π/3)sin(x+π/2)化简
人气:386 ℃ 时间:2020-05-19 19:40:49
解答
y=sin(x+π/3)sin(x+π/2)=(sinxcosπ/3+cosxsinπ/3)cosx=1/2sinxcosx+√3/2 cos²x=1/4sin2x+√3/4(cos2x+1)=1/4sin2x+√3/4 cos2x+√3/4=1/2(1/2sin2x+√3/42cos2x)+√3/4=1/2sin(2x+π/3) +√3/4
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