Easy
1 point
ID: #27049
Question
a^2+(1/a^2) = 2 , a - 1/a = ?
Options
1
3
Correct Answer
2
0
Correct Answer
3
1
Correct Answer
4
2
Correct Answer
Explanation
দেওয়া আছে, a^2 + 1/a^2 = 2. আমরা জানি, a^2 + b^2 = (a-b)^2 + 2ab. বা, (a - 1/a)^2 + 2.a.(1/a) = 2. বা, (a - 1/a)^2 + 2 = 2. বা, (a - 1/a)^2 = 0. সুতরাং, a - 1/a = 0.
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Type
Single Choice
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