如何证明tan x/2 =sin/(1+cosx)=(1-cosx)/sinx哪位大哥给算出来呀
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如何证明tanx/2=sin/(1+cosx)=(1-cosx)/sinx哪位大哥给算出来呀如何证明tanx/2=sin/(1+cosx)=(1-cosx)/sinx哪位大哥给算出来呀如何证明tanx
如何证明tan x/2 =sin/(1+cosx)=(1-cosx)/sinx哪位大哥给算出来呀
如何证明tan x/2 =sin/(1+cosx)=(1-cosx)/sinx
哪位大哥给算出来呀
如何证明tan x/2 =sin/(1+cosx)=(1-cosx)/sinx哪位大哥给算出来呀
tan(x/2)
=sin(x/2)/cos(x/2)
=2sin(x/2)cos(x/2)/2cos²(x/2)
=sinx/(1+cosx)
=sinx(1-cosx)/(1+cosx)(1-cosx)
=sinx(1-cosx)/(1-cos²x)
=sinx(1-cosx)/sin²x
=(1-cosx)/sinx
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