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(cosa-2)^2+(sina)^2=3
(cosa)^2-4cosa+4+(sina)^2=3
1-4cosa+4=3
cosa=1/2
a=π/3或者a=-π/3
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(cosα-2)^2+(sinα)^2=3 (cosα)^2+(sinα)^2-4cosα+4=3 cosα=1/2 α=π/3或α=5π/3