Prove the following Lemma. If D and F are the mid-points of AB and AC, then DF is parallel to BC and mDF =1/2mBC.
\frac{2x}{\sqrt{18xy}}
3x+2y=19
x+y=8
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4x+2=3x+4
If f(x, t) is continuous for all x >= a and t \in [alpha, beta] and phi(x) bounded and integrable phi(x), [a, epsilon] for all eps...
x/3=12
3x+y=7
x_y=1
(x−1)2(x-1)^{2}(x−1)2 =4
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