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in Integrals calculus by (41.7k points)

I = ∫((10x9 + 10xloge10)/(x10 + 10x))dx  is equal to

(A) 10x + x10 + c 

(B) 10x − x10 + c 

(C) 10x + x10 + c 

(D) ln (10x + x10) + c

1 Answer

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Best answer

Answer is (D) ln (10x + x10) + c

If p = x10 + 10x, then

(10x9 + 10xloge10)dx = dp

⇒ I = ∫dp = p + c

⇒ I = ln(x10 + 10x) + c

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