若直线x/a + y/b =1 通过点(cosa,sina),则A.aˇ2 + bˇ2 ≤ 1 B.aˇ2 + bˇ2 ≥1C.1/ aˇ2 + 1/ bˇ2 ≤1 D.1/ aˇ2 + 1/ bˇ2 ≥1
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![若直线x/a + y/b =1 通过点(cosa,sina),则A.aˇ2 + bˇ2 ≤ 1 B.aˇ2 + bˇ2 ≥1C.1/ aˇ2 + 1/ bˇ2 ≤1 D.1/ aˇ2 + 1/ bˇ2 ≥1](/uploads/image/z/14801940-36-0.jpg?t=%E8%8B%A5%E7%9B%B4%E7%BA%BFx%2Fa+%2B+y%2Fb+%3D1+%E9%80%9A%E8%BF%87%E7%82%B9%28cosa%2Csina%29%2C%E5%88%99A.a%CB%872+%2B+b%CB%872+%E2%89%A4+1+B.a%CB%872+%2B+b%CB%872+%E2%89%A51C.1%2F+a%CB%872+%2B+1%2F+b%CB%872+%E2%89%A41+D.1%2F+a%CB%872+%2B+1%2F+b%CB%872+%E2%89%A51)
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