Teaching DSSSB TGT Mock Test 2025 Electromagnetic Theory Vector Calculus

If A = 5t2 I + t J – t3 K, B = sin t I – cos t J, find\(\frac{d}{{dt}}\left( {A.B} \right)\)

1
5t2 cos t + 9t sin t + cos t
2
5t2 cos t + 11t sin t – cos t
3
5t2 cos t + 11t sin t + cos t
4
5t2 cos t + 9t sin t – cost
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