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(3tan105°)÷(1—tan的平方75°)求解答过程,
人气:362 ℃ 时间:2020-09-11 18:42:39
解答
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
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