tan^2b-tanb-2=0 (b为锐角),则tanb=____?要有过程奥!

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tan^2b-tanb-2=0(b为锐角),则tanb=____?要有过程奥!tan^2b-tanb-2=0(b为锐角),则tanb=____?要有过程奥!tan^2b-tanb-2=0(b为锐角),

tan^2b-tanb-2=0 (b为锐角),则tanb=____?要有过程奥!
tan^2b-tanb-2=0 (b为锐角),则tanb=____?
要有过程奥!

tan^2b-tanb-2=0 (b为锐角),则tanb=____?要有过程奥!
(tanb -2)(tanb+1)=0
b为锐角 所以 tanb=2

(tanb+1)(tanb-2)=0
tanb=2