若f(x)=2tanx-(2sin^(x/2)-1)/(sin(x/2)cos(x/2)),则f(π/12)的值是

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若f(x)=2tanx-(2sin^(x/2)-1)/(sin(x/2)cos(x/2)),则f(π/12)的值是
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若f(x)=2tanx-(2sin^(x/2)-1)/(sin(x/2)cos(x/2)),则f(π/12)的值是
若f(x)=2tanx-(2sin^(x/2)-1)/(sin(x/2)cos(x/2)),则f(π/12)的值是

若f(x)=2tanx-(2sin^(x/2)-1)/(sin(x/2)cos(x/2)),则f(π/12)的值是
f(x)=2tanx-(2sin^2 (x/2) -1)/(sinx/2*cosx/2)
f(x)=2tanx +cos x /(1/2 * sin x )
=2tanx +2 cotx
=2[(sin x /cos x )+(cos x /sin x)]=4/sin(2x)
将π/12带入,=8

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