cos(π-2a)/sin(a-π/4)=-√2/3 求cosa+sina=_ 求推导

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cos(π-2a)/sin(a-π/4)=-√2/3 求cosa+sina=_ 求推导
cos(π-2a)/sin(a-π/4)=-√2/3 求cosa+sina=_ 求推导

cos(π-2a)/sin(a-π/4)=-√2/3 求cosa+sina=_ 求推导
cos(π-2a)/sin(a-π/4)=-√2/3
-con2a/√2(sina-cona)=-√2/3
con2a/(sina-cona)=1/3
[(cona)^2-(sina)^2]/(sina-cona)=1/3
(cona+sina)(cona-sina)/(cona-sina)=1/3
cona+sina=1/3