If sin α + cos α = m, sin α × cos α = n (m > 0, n > 0), then what is the relationship between M and N, What is "^"?
(sinα+cosα)^2=1+2sinαcosα=1+2n=m^2;
So n = (m ^ 2-1) / 2
^M ^ 2 is the square of M
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