cos(兀-2a)/sin(a-兀/4)=-√2/2则cosa+sina=什么已知tan(a+兀/4)=2则1+3sina×cosa-2cos
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cos(兀-2a)/sin(a-兀/4)=-√2/2则cosa+sina=什么已知tan(a+兀/4)=2则1+3sina×cosa-2cos
cos(兀-2a)/sin(a-兀/4)=-√2/2
则cosa+sina=什么
已知tan(a+兀/4)=2则1+3sina×cosa-2cos
cos(兀-2a)/sin(a-兀/4)=-√2/2则cosa+sina=什么已知tan(a+兀/4)=2则1+3sina×cosa-2cos
cos(兀-2a)/sin(a-兀/4)=-√2/2
cos2a/ √2/2(sina-cosa) =- √2/2
(cos^2a-sin^2a)/(sina-cosa)=1/2 cosa+sina=-1/2
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