已知sin&cos&=60/169(0
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已知sin&cos&=60/169(0
已知sin&cos&=60/169(0
已知sin&cos&=60/169(0
sin(π/2-a)=3/5 cosa=3/5 cos(π-2a)=-cos2a=-2cos 2;a 1 =-18/25 1 =7/25 sin(π/2-a)=cosa=3/5 cos(π-2a) =-cos2a =