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Find the value of 1+31−3+1−31+3\frac{1 + \sqrt{3}}{1 - \sqrt{3}} + \frac{1 - \sqrt{3}}{1 + \sqrt{3}} \\1−3​1+3​​+1+3​1−3​​​
Question

Find the value of 1+313+131+3\frac{1 + \sqrt{3}}{1 - \sqrt{3}} + \frac{1 - \sqrt{3}}{1 + \sqrt{3}} \\

A.

–4

B.

–2√3

C.

2√3

D.

4

Correct option is A

​Solution:

1+313+131+3Step 1: Multiply both terms by the conjugate to simplify:=(1+3)2(13)(1+3)+(13)2(1+3)(13)=(1+3)2+(13)2(13)(1+3)=(12+213+(3)2)+(12213+(3)2)12(3)2=(1+23+3)+(123+3)13=(4+23)+(423)2=82=4\frac{1 + \sqrt{3}}{1 - \sqrt{3}} + \frac{1 - \sqrt{3}}{1 + \sqrt{3}} \\\text{Step 1: Multiply both terms by the conjugate to simplify:} \\= \frac{(1 + \sqrt{3})^2}{(1 - \sqrt{3})(1 + \sqrt{3})} + \frac{(1 - \sqrt{3})^2}{(1 + \sqrt{3})(1 - \sqrt{3})} \\= \frac{(1 + \sqrt{3})^2 + (1 - \sqrt{3})^2}{(1 - \sqrt{3})(1 + \sqrt{3})} \\= \frac{(1^2 + 2\cdot1\cdot\sqrt{3} + (\sqrt{3})^2) + (1^2 - 2\cdot1\cdot\sqrt{3} + (\sqrt{3})^2)}{1^2 - (\sqrt{3})^2} \\= \frac{(1 + 2\sqrt{3} + 3) + (1 - 2\sqrt{3} + 3)}{1 - 3} \\= \frac{(4 + 2\sqrt{3}) + (4 - 2\sqrt{3})}{-2} \\= \frac{8}{-2} \\= -4

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