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#if x^2/a^2 +y^2/b^2 =1,
#if x^2/a^2 + y^2/b^2 = 1 find dy/dx,
#eliminate constants 2z = x^2/a^2 + y^2/b^2,
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#arbitrary constants 2z = x^2/a^2 + y^2/b^2,
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#if f(x+1) = x^2-3x+2 then find the value of f(x) ?,
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