sina*cosa=1-cos2a 求tana的值?
人气：251 ℃ 时间：2020-04-02 13:10:50
解答
sina * cosa = 1-cos2a = 2* (sina)^2
sina ≠ 0时,两边同除以sina的平方
cota = 2
tana = 0.5
sina = 0时,tana = 0
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