若1+tanx/1−tanx=2010,则1/cos2x+tan2x的值为_.

问题描述:

1+tanx
1−tanx
=2010,则
1
cos2x
+tan2x的值为______.

因为

1+tanx
1−tanx
=2 010,
1
cos2x
+tan2x=
1
cos2x
+
sin2x
cos2x
=
1+sin2x
cos2x
=
(sinx+cosx)2
cos2x−sin2x

=
cosx+sinx
cosx−sinx
=
1+tanx
1−tanx
=2010.
故答案为:2010