1、过点p(1,2)且在x轴,y轴上的截距相等的直线方程是2、三条直线x+y=2,x-y=0,x+ay=3能构成三角形,则a不等于3、已知sin(a+π/4)+sin(a-π/4)=(根号2)/3,(1)求sina得值,(2)求{sin(a-π/4)}/(1-cos2a
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![1、过点p(1,2)且在x轴,y轴上的截距相等的直线方程是2、三条直线x+y=2,x-y=0,x+ay=3能构成三角形,则a不等于3、已知sin(a+π/4)+sin(a-π/4)=(根号2)/3,(1)求sina得值,(2)求{sin(a-π/4)}/(1-cos2a](/uploads/image/z/3485233-1-3.jpg?t=1%E3%80%81%E8%BF%87%E7%82%B9p%EF%BC%881%2C2%EF%BC%89%E4%B8%94%E5%9C%A8x%E8%BD%B4%2Cy%E8%BD%B4%E4%B8%8A%E7%9A%84%E6%88%AA%E8%B7%9D%E7%9B%B8%E7%AD%89%E7%9A%84%E7%9B%B4%E7%BA%BF%E6%96%B9%E7%A8%8B%E6%98%AF2%E3%80%81%E4%B8%89%E6%9D%A1%E7%9B%B4%E7%BA%BFx%2By%3D2%2Cx-y%3D0%2Cx%2Bay%3D3%E8%83%BD%E6%9E%84%E6%88%90%E4%B8%89%E8%A7%92%E5%BD%A2%2C%E5%88%99a%E4%B8%8D%E7%AD%89%E4%BA%8E3%E3%80%81%E5%B7%B2%E7%9F%A5sin%EF%BC%88a%2B%CF%80%2F4%EF%BC%89%2Bsin%EF%BC%88a-%CF%80%2F4%EF%BC%89%3D%EF%BC%88%E6%A0%B9%E5%8F%B72%EF%BC%89%2F3%2C%EF%BC%881%EF%BC%89%E6%B1%82sina%E5%BE%97%E5%80%BC%2C%EF%BC%882%EF%BC%89%E6%B1%82%7Bsin%EF%BC%88a-%CF%80%2F4%29%7D%2F%281-cos2a)
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