In Exercises 13-18, use limit laws and continuity properties . Frercises 13-18, use limit laws and continuity properties to evaluate the limit. (4xy² – x) (xy² sin xy) 14. lim 13. (x.y)(1,3) (x,y) (1/2,7) xy 15. lim (x.y)→(-1,2) x +y 16. lim (x,y)→(1,–3) 17. (x.y)→ (0,0) lim In(1+x²y*) 18. lim xVy3 + 2x (x,y) (4,-2)

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A: Option fourth is correct answer. 

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A: Let's Solve,

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Q: Find the distance between the planes – 3x + 5y = 32 and – 3x + 5y = 27.

A: Simply use the formula for the distance between two planes. 

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Q: .determine the equation of the orthogonal trajectories of the following families curves:

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