MCQ
Which of the following two sets are equal?
- AA = {1, 2} and B = {1}
- BA = {1, 2} and B = {1, 2, 3}
- CA = {1, 2, 3} and B = {2, 1, 3}
- DA = {1, 2, 4} and B = {1, 2, 3}
Solution:
Two sets are equal if and only if they have the same elements.
So, A = {1, 2, 3} and B = {2, 1, 3} are equal sets.
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If $2\tan\alpha=3\tan\beta$ then $\tan(\alpha-\beta)=$
$\frac{\sin2\beta}{5-\cos2\beta}$
$\frac{\cos2\beta}{5-\cos2\beta}$
$\frac{\sin2\beta}{5+\cos2\beta}$
None of these