(tgx+tgy)/tg(x+y)+(tgx-tgy)/tg(x-y)=tg(x+y)/tg(x+y)+tg(x-y)/tg(x-y)=1+1=2
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(tgx+tgy)/tg(x+y)+(tgx-tgy)/tg(x-y)=tg(x+y)/tg(x+y)+tg(x-y)/tg(x-y)=1+1=2