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प्रश्न
Evaluate: (3c - 5d)(4c - 6d)
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उत्तर
(3c - 5d)(4c - 6d)
= 3c (4c - 6d) - 5d(4c - 6d)
= 12c2 - 18cd - 20cd + 30d2
= 12c2 - 38cd + 30d2
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