1/Cos²θ=b²/(Cos²θ+a²-1)怎么化简得Cosθ=√[(a²-1)/(b²-1)]

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1/Cos²θ=b²/(Cos²θ+a²-1)怎么化简得Cosθ=√[(a²-1)/(b²-1)]1/Cos²θ=b²/

1/Cos²θ=b²/(Cos²θ+a²-1)怎么化简得Cosθ=√[(a²-1)/(b²-1)]
1/Cos²θ=b²/(Cos²θ+a²-1)怎么化简得Cosθ=√[(a²-1)/(b²-1)]

1/Cos²θ=b²/(Cos²θ+a²-1)怎么化简得Cosθ=√[(a²-1)/(b²-1)]
1/Cos²θ=b²/(Cos²θ+a²-1)
b²Cos²θ=Cos²θ+a²-1
(b²-1)Cos²θ=a²-1
Cos²θ=(a²-1)/(b²-1)
Cosθ=±√[(a²-1)/(b²-1)]