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已知sina*cosa=3/8，且pai/4<a熱心網友sina*cosa=3/8 = -2*sina*cosa=-3/4Cos^2(a)+Sin^2(a)=1 :學數學都知道Cos^2(a)-2*sina*cosa+Sin^2(a)=1-(3/4)(Cosa-Sina)^2=1/4Cosa-Sina=1/2..多動下腦子。。邏輯不難啊
sina*cosa=3/8 = -2*sina*cosa=-3/4Cos^2(a)+Sin^2(a)=1 :學數學都知道Cos^2(a)-2*sina*cosa+Sin^2(a)=1-(3/4)(Cosa-Sina)^2=1/4Cosa-Sina=1/2..多動下腦子。。邏輯不難啊
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