tan t/2怎么算出等于sin t /(1+cos t).
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tan t/2怎么算出等于sin t /(1+cos t).
tan t/2怎么算出等于sin t /(1+cos t).
tan t/2怎么算出等于sin t /(1+cos t).
an2α = 2tanα/[1 - (tanα)^2]
tan(1/2*α)=(sin α)/(1+cos α)=(1-cos α)/sin α
推导:
tan(2a) = tan(a+a) = (tan(a) + tan(a))/(1 - tan(a)*tan(a) )= 2tanα/[1 - (tanα)^2]