3tan105°/(1-tan^2 75°)= (怎么化简)

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3tan105°/(1-tan^2 75°)= (怎么化简)
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3tan105°/(1-tan^2 75°)= (怎么化简)
3tan105°/(1-tan^2 75°)= (怎么化简)

3tan105°/(1-tan^2 75°)= (怎么化简)
3tan105°/(1-tan^2 75°)
=3tan(180-75)/(1-(tan75)^2)
=-3/2*2tan75/[1-(tan75)^2]
=-3/2*tan(75*2)
=-3/2*tan(180-30)
=-3/2*(-tan30)
=3/2*根号3/3
=根号3 /2