7/2*sin2x+√3/2*cos2x

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7/2*sin2x+√3/2*cos2x7/2*sin2x+√3/2*cos2x7/2*sin2x+√3/2*cos2x令cosa=7√13/26,sina=√39/267/2*sin2x+√3/2*

7/2*sin2x+√3/2*cos2x
7/2*sin2x+√3/2*cos2x

7/2*sin2x+√3/2*cos2x
令cosa=7√13/26 ,sina= √39/26
7/2*sin2x+√3/2*cos2x
=√13*[7√13/26*sin2x+√39/26*cos2x)]
=√13*(sin2xcosa+cos2xsina)
=√13sin(2x+a)