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प्रश्न
Compute the following:
`[(a,b),(-b, a)] + [(a,b),(b,a)]`
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उत्तर
`[(a,b),(-b, a)] + [(a,b),(b,a)]`
=` [(a+a, b+b),(-b+b, a+a)]`
=` [(2a, 2b),(0, 2a)]`
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