I actually solved this in my head No pencil, no paper But since you can't see into my head, let's put these equations in the form of...
選択した画像 prove that x^-1/x^-1 y^-1 x^-1/x^-1-y^-1=2y^2/y^2-x^2 671484
If x and y are reals such that 0 ≤ x 2 y 2 ≤ π , how does one prove that cos x cos y ≤ 1 cos x y ?To ask Unlimited Maths doubts download Dou...
Y=-x^2 4 142421-Y=x^2-4x+7
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