tana=根号2,sin2a=?
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tana=根号2,sin2a=?
![tana=根号2,sin2a=?](/uploads/image/z/18338942-38-2.jpg?t=tana%3D%E6%A0%B9%E5%8F%B72%2Csin2a%3D%3F)
sin2a=2sinacosa
=2sinacosa/1
=2sinacosa/(sin²a+cos²a)
分子分母同除以cos²a得
=2 tana/( tan²a+1)
=2√2/3.
=2sinacosa/1
=2sinacosa/(sin²a+cos²a)
分子分母同除以cos²a得
=2 tana/( tan²a+1)
=2√2/3.
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