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(2001•沈阳)已知sina=,且a是锐角,则a=A.75°B.60°C.45°D.30...
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(2001•沈阳)已知sina=
,且a是锐角,则a=( )
A.75°
B.60°
C.45°
D.30°
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(2001•沈阳)已知sina=,且a是锐角,则a=( )
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