.3 T || f(r, e) r de dr Jo 0.

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A: Question : A certain lottery has 32 number in how many ways can 4 numbers be selected? .

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A: Given query is to find the solution of the differential equation.

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A: Please see the below picture for detailed solution. 

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Q: Find the perimeter of the triangle whose vertices are: 1. A(2,1), B(3, -5) and C(1, -3)

A: A(2, 1), B(3, -5) and C(1, -3) 

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Q: Find the 30th derivative of y = cos(2x). f(30)(x) =

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