问题
填空题
设
|
答案
由
=2解得,tanx=1+tanx 1-tanx
,1 3
∵sin2x=
=2sinxcosx sin2x+cos2x
=2tanx tan2x+1
=2× 1 3
× 1 3
+11 3
,3 5
故答案为:
.3 5
设
|
由
=2解得,tanx=1+tanx 1-tanx
,1 3
∵sin2x=
=2sinxcosx sin2x+cos2x
=2tanx tan2x+1
=2× 1 3
× 1 3
+11 3
,3 5
故答案为:
.3 5