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tg(x-y)=(tgx-tgy)/(1+tgx * tgy)
Conocemos tgx=1/2 y tgy=1/4, entonces sustituimos:
tg(x-y)=(1/2-1/4) / (1+1/2 * 1/4)
tg(x-y)=(1/4) / (9/8)
tg(x-y)=1*8/9*4=8/36=2/9