问题
选择题
若tanθ+
|
答案
若tanθ+
=8，则1 tanθ
sin2θ=2sinθcosθ=
=2sinθcosθ sin2θ+cos2θ
=2tanθ tan2θ+1
=2 tanθ+ 1 tanθ
=2 8 1 4
故选B
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若tanθ+
|
若tanθ+
=8，则1 tanθ
sin2θ=2sinθcosθ=
=2sinθcosθ sin2θ+cos2θ
=2tanθ tan2θ+1
=2 tanθ+ 1 tanθ
=2 8 1 4
故选B