We have f(x)= 2x-3 and g(x) = x^2 - 2
fog(x) = f(g(x))
=> f( x^2 - 2)
=> 2*(x^2 - 2) - 3
=> 2x^2 - 4 - 3
=> 2x^2 - 7
The derivative of 2x^2 - 7 = 4x
The required derivative is 4x.
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