已知角a∈(π/4,π/2 ),且(4cosa- 3sina )(2cosa- 3sina)=0 (1)tan( a+π/4)(2)co已知角a∈(π/4,π/2 ),且(4cosa- 3sina )(2cosa- 3sina)=0 (1)tan( a+π/4)(2)cos(π/3-2a)
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![已知角a∈(π/4,π/2 ),且(4cosa- 3sina )(2cosa- 3sina)=0 (1)tan( a+π/4)(2)co已知角a∈(π/4,π/2 ),且(4cosa- 3sina )(2cosa- 3sina)=0 (1)tan( a+π/4)(2)cos(π/3-2a)](/uploads/image/z/15049380-12-0.jpg?t=%E5%B7%B2%E7%9F%A5%E8%A7%92a%E2%88%88%28%CF%80%2F4%2C%CF%80%2F2+%29%2C%E4%B8%94%284cosa-+3sina+%29%282cosa-+3sina%29%3D0+%281%29tan%28+a%2B%CF%80%2F4%29%282%29co%E5%B7%B2%E7%9F%A5%E8%A7%92a%E2%88%88%28%CF%80%2F4%EF%BC%8C%CF%80%2F2+%29%2C%E4%B8%94%284cosa-+3sina+%29%282cosa-+3sina%29%3D0+%EF%BC%881%EF%BC%89tan%28+a%2B%CF%80%2F4%EF%BC%89%EF%BC%882%EF%BC%89cos%28%CF%80%2F3%EF%BC%8D2a%EF%BC%89)
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