I got solution of a question. Can any body explain the highlighted lines to me
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Originally Posted by moonnightingale I got solution of a question. Can any body explain the highlighted lines to me d was just factored out: $\displaystyle \sqrt{a^2+b^2}=\sqrt{a^2\left(1+\frac{b^2}{a^2}\ri ght)} = a\sqrt{1+\frac{b^2}{a^2}}$ Tonio
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