〓数学〓关于三角函数的变换〓小诺求助〓
y=3^1/2cosx-sinx(3^1/2就是根号三,打不出来,不好意思!)这个式子是=-2sin(x-π/3)还是=2sin(x-π/3)?谢谢!^_^
参考答案:y=√3cosx-sinx
=2*(√3/2*cosx-1/2*sinx)
=2(sinπ/3*cosx-cosπ/3*sinx)
=2sin(π/3-x)
=-2sin(x-π/3)
y=3^1/2cosx-sinx(3^1/2就是根号三,打不出来,不好意思!)这个式子是=-2sin(x-π/3)还是=2sin(x-π/3)?谢谢!^_^
参考答案:y=√3cosx-sinx
=2*(√3/2*cosx-1/2*sinx)
=2(sinπ/3*cosx-cosπ/3*sinx)
=2sin(π/3-x)
=-2sin(x-π/3)