若1+tanx/1−tanx=2010,则1/cos2x+tan2x的值为_.
问题描述:
若
=2010,则1+tanx 1−tanx
+tan2x的值为______. 1 cos2x
答
因为
=2 010,1+tanx 1−tanx
则
+tan2x=1 cos2x
+1 cos2x
=sin2x cos2x
=1+sin2x cos2x
(sinx+cosx)2
cos2x−sin2x
=
=cosx+sinx cosx−sinx
=2010.1+tanx 1−tanx
故答案为:2010