x=π/12,2(tanx+1/tan),怎么算,_数学解答

x=π/12,2(tanx+1/tan),怎么算,

人气：365 ℃　时间：2020-04-15 09:58:19

解答

2(tanx+1/tanx)
=2(sinx/cosx+cosx/sinx)
=2(1/(cosxsinx)
=4/sin2x
=4/sinπ/6
=4/sin30
=4*2=8