Others Maths Puzzle

Q. Solve integration :
1/sqrt (x^2 + r^2)^3 dx from 0 to infinity

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Others Other Question

Q. Solve:
1/sqrt (x^2 + r^2)^1.5 dx from 0 to infinity Q. The cost of 4 CD(s) is 4 more than the cost of a DVD. The cost of 1 CD(s) and a DVD is 10. What is the cost of a DVD?