已知tanθ=2,则sin
2θ+sinθcosθ-2cos
2θ=( )
A. -
B.
C. -
D.
人气:250 ℃ 时间:2020-03-27 14:58:38
解答
sin
2θ+sinθcosθ-2cos
2θ
=
sin2θ+sinθcosθ-2cos2θ |
sin2θ+cos2θ |
=
=
=
.
故选D.
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