I have the expression:
expr = k^2 p^2 Sin[θ]^2 - k^2(p (k Sin[θ])/k1)^2 - p^2(-k Sin[θ] Sqrt[1 - ((k Sin[θ])/k1)^2] + k Cos[θ] (k Sin[θ])/k1) + p k Cos[θ]2(-k Sin[θ] Sqrt[1-((k Sin[θ])/k1)^2] + k Cos[θ] (k Sin[θ])/k1)(p (k Sin[θ])/k1);
k1 = Sqrt[p^2+k^2-2p k Cos[θ]];
Next I do
z6 = ExpandAll[expr]; k = 100; θ = Pi/3; z6 /. p -> 100
and I get
I try to put the result into numerical form in this way:
% // N
and I get
But I need a one-number answer. Where may my error be?
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