# Quick calc question

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Which of the following integrals cannot be evaluated using a simple substitution?

the integral of the square root of the quantity x minus 1, dx
the integral of the quotient of 1 and the square root of the quantity 1 minus x squared, dx
the integral of the quotient of 1 and the square root of the quantity 1 minus x squared, dx
the integral of x times the square root of the quantity x squared minus 1, dx

• Quick calc question -

#2 and #2 look the same to me.

note that d(x^2) = 2x dx

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