Question

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Answer 1

factor the denominator

Answer 2

\(a^2-b^2 = (a+b)(a-b)\)

Answer 3

so,
\(x-1 = (\sqrt{x})^2-1^2= ... ?\)

Answer 4

also since we have to get the form of sin x/x also
we can do this adjustment first,

got that adjustment ?