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√2,2√3,3,4 корень из двух самый маленький а число 4 самое большое
Tga+ctga=1/tga+tga=(1+tg²a)/tga
4ctga:(1+tg²a+1)/tga=4ctga*tga/(1+tg²a)=4/(1+tg²a)
4/(1+tg²a)*(1+tg²a)=4
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√x=1/x
x²=√x
√x=-2/x
√x=x³
смотри графики.