已知tan2θ=3/4(π/2
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已知tan2θ=3/4(π/2
已知tan2θ=3/4(π/2
已知tan2θ=3/4(π/2
解
tan2θ=(2tanθ)/(1-tan^2θ)=3/4
即3(1-tan^2θ)=8tanθ
即3tan^2θ+8tanθ-3=0
(3tanθ-1)(tanθ+3)=0
∵π/2