tana=0.5求tan(pi/2+2a)
tana=2求sin(pi-a)cos(2pi-a)sin(-a+3pi/2)/tan(-a-pi)sin(-pi-a)
tan(pi/4+a)=0.5 (1)求tana(2)求sin2a-cos^2a/1+cos2a
tana+1/tana=3,求sina*cosa tan^2 a+1/tan^2 a
已知a为锐角,且tan(pi/4+a)=2(1)求tana的值(2)求sin2acosa-sina/cos2a的值
f(a)=sin(pi-a)cos(2pi-a)tan(-a+3pi/2)/cos(-pi-a) 求 f(-31pi/3
已知tanA-(1/tanA)=2,其中A为锐角,求tan^2+(1/tan^2)
tana=2 a 为锐角.求tan a/2
tanθ=a,求[sin(pi/4+θ)/sin(pi/2-θ)]*tan2θ
tanθ=a,求[sin(pi/4+θ)/sin(pi/2-θ)]*tan2θ,
已知tana/2=2求tan(a+π/4)
已知tana=2,求tan(a-π/4)
求证tan(A/2)-{1/(tanA/2)}=-2/tanA