如图左边怎么化简到右边

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如图左边怎么化简到右边如图左边怎么化简到右边如图左边怎么化简到右边∵cost=1-2sin²t/2左边=sint/(1-cost)=(2sint/2×cost/2)/[1-(1-2sin&#

如图左边怎么化简到右边
如图左边怎么化简到右边

如图左边怎么化简到右边
∵ cost=1-2sin²t/2
左边=sint/(1-cost)
=(2sint/2×cost/2)/[1-(1-2sin²t/2)]
=(2sint/2×cost/2)/(2sin²t/2)
=(cost/2)/(sint/2)
=cot(t/2)
=右边