已知sin(a+π/3)+sina=-(4倍根号下3)/5,-π/2

已知sin(π+a)=1/3,则sina= 已知(sina+cosa)/(sina-cosa)=3 则2sin'a+(sina-cosa)'=? 已知sin=-3/5,那么(cosa+sina/cosa-sina)+(cosa-sina/cosa+sina)(a代表角, 已知sina=-1/3 则sin(a+x)= 已知sina=15/17,a∈(π/2,π),求sin(π/3+a),sin(π/3-a) 已知sina=15/17,a∈（π/2,π)求sin(π/3+a),sin(π/3-a)急 已知tan{π/4+a}=3,求sina*sin(3π /2 +a)-sin^2a+1的值 已知sina=1/3,则sin(a+π/4)cos(a+π/4) 已知cos(a+β)cosa+sin(a+β)sina=--0.2,求sin(3π/2-β) 已知a是第三象限角,若f(a)=sin(π-a)sin(-a+3π/2)tan(-a-π)/sin(3π+a),化简.答案-sina, 已知3SIN^2A+2SIN^2B=5SINA,求SIN^2A+SIN^2B范围 已知tana=-3,求sina+2cosa/cosa-3sina和sin^2a-sinacosa 在三角形ABC中,已知(sinA+sin+B+sinC)(sinA+sinB-sinC)=3,a 已知sin(a+π/3)+sina=-4√3/5,-π/2 已知sin(a+π/3)+sina=-(4倍根号下3)/5,-π/2 已知sin(a+π/3)+sina=-4√3/5,-π/2 已知sin(a+π/3)+sina=-4根号3/5,-π/2 已知sin(a+π/3)+sina=-4根号3/5 -π/2