证明1+sin2a/2cos^2a+sin2a=1/2tana+1/2
证明 2(sin2a+1)/1+sin2a+cos2a=tana+1
求证:2(sin2a+1)/(1+sin2a+cos2a)=tana+1
证明:(sin2a+1)/(sin2a+cos2a+1)=1/2(tana+1)
化简sin2a(1+tana*tana/2)
已知(2sin^a+sin2a)/(1+tana)=k (0
1-sin2a-cos^2(a-π/4)
证明tanA+cotA=2/sin2A
证明(1+sin2a)/(cosa^2-sina^2)=(1+tana)/(1-tana)
化简(2sin^2a+sin2a)/(1+tana)
tan(pi/4+a)=0.5 (1)求tana(2)求sin2a-cos^2a/1+cos2a
已知2sin2a+1=cos2a,求tana的值
化简[2sin2a/(1+cos2a)]*(cos^2a/cos2a)