若tanα=2,则sin2α-cos2α/1+cos²α
若tanα=2,则sin2α-cos2α/1+cos²α
其他人气:194 ℃时间:2020-02-03 10:48:53
优质解答
(sin2α-cos2α)/(1+cos²α)= (2sinαcosα-cos²α+sin²α)/(sin²α+2cos²α)分子分母同除以cos²α:= (2tanα-1+tan²α)/(tan²α+2)= (2*2-1+2²)/(2²+2)= 7/6...
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