若tanA=a,则sin(-5π-A)cos(3π+A)=________

若sin²A+sin²C-sin²B=sinAsinC,且c=3a,则tanA 若sin(a-π),a为第四象限角,则tana等于若sin(a-π)=3/5,a为第四象限角,则tana等于 若tanA=a,则sin(-5π-A)cos(3π+A)=________ 若△ABC,sin²A+sin²C-sin²B=sinAsinC,且c=3a,则tanA= 若tana=2,则sin²a= 若tana=2则sin^2a+sinacosa 已知tana=2,则[sin(π/2+a)-cos(π-a)]/[sin(π/2-a)-sin(π-a)]=? 若sin(a+β)=3/5,sin(a-β)=1/5,则tana/tanβ= 若sin(a+β)=1/5,sin(a-β)=3/5,则tana/tanβ sin(A+B)=4/5,sin(A-B)=-3/5,则tanA/tanB= sin(a+b)=1/3,sin(a-b)=1/5,则tana*cotb=? 1.若tana=3,则 sin2a/ cos^2 a 的值等于?2.若a属于（0,π/2）且sin^2 a+cos2a=1/4 则tana=?1.若tana=3,则 sin2a/ cos^2 a 的值等于?2.若a属于（0,π/2）且sin^2 a+cos2a=1/4 则tana=?3.已知函数F(x)=3sin^2 πx/2 +1 ,则使得f(x+c)恒 已知tan(A-B)/tanA+sin^2C/sin^2A=1,求证：tanA*tanB=tan^2C 若tanA=2,则Sin(2分之3π+2A）=? 已知tan(A-B)/tanA+sin^2C/sin^2A=1,求证：tanA×tanB＝tan^C求证tanA×tanB＝tan^2C a属于2分之π.且sin=3/5,则tana的值 若tana=-2,则1/4sin^2a+2/5cos2a= tana=m则sin（a+3π）+cos(π+a)/sin(-a)-cos(π+a)=?