将2sinα-2sin(α-π/3)化为Asin(α+β)的形式是
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将2sinα-2sin(α-π/3)化为Asin(α+β)的形式是
将2sinα-2sin(α-π/3)化为Asin(α+β)的形式是
将2sinα-2sin(α-π/3)化为Asin(α+β)的形式是
用a
原式=2sina-2(sinacosπ/3-cosasinπ/3)
=2sina-sina+√3cosa
=sina+√3cosa
=2(sina*1/2+cosa*√3/2)
=2(sinacosπ/3+cosasinπ/3)
=2sin(a+π/3)
=2(sina-1/2sina+(3^1/2)/2cosa)
=2(1/2sina+(3^1/2)/cosa)
=2sin(a+∏/3)
原式=2sinα-2(sinαcosπ/3-cosαsinπ/3)=sinα+√3cosα=2sin(α+π/3)
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