помогите решить
ctg 40 * tg 140
ctg 40=1.1918
tg140= ctg50=0.8391
ctg40*tg140=1.1918*0.8391=1.0000393
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ctg 40=1.1918
tg140= ctg50=0.8391
ctg40*tg140=1.1918*0.8391=1.0000393