defence exam Agniveer Vayu Group X & XY Mock Test 01/2026 Mathematics Differential Calculus Evaluation of derivatives

If r = 3t\(\hat{i}\) + 4tj - 7t2k, find the derivative dr/dt?

1
3i + 4j - 14tk
2
3i + 4j + 14tk
3
3i + 7j + 78k
4
3i + 2j - 5k
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