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int(5x^8+7x^6)/(x^2+1+2x^7)dx is equal t...

`int(5x^8+7x^6)/(x^2+1+2x^7)dx` is equal to (a) `x/(x^2+1+2x^7)+C` (b) `x^7/(x^2+1+2x^7)+C` (c) `x^6/(x^2+1+2x^7)+C` (d) `x^2/(x^2+1+2x^7)+C`

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int(5x^(8)+7x^(6))/(x^(2)+1+2x^(7))dx is equal to (a) (x)/(x^(2)+1+2x^(7))+C( b) (x^(7))/(x^(2)+1+2x^(7))+C (c) (x^(6))/(x^(2)+1+2x^(7))+C(d)x^(2)+1+2x^(7)+C

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int (2x ^ (3) + 3x ^ (2) + 4x + 5) / (2x + 1) dx equls to: (A) (x ^ (3)) / (2) + (x ^ (2)) / (2) +3 (x) / (2) + (7) / (4) ln (2x + 1) + C (B) 5 (x ^ (3)) / (2) + 6 (x) / (2) + (7) / (4) ln (2x + 1) + C (C) 3 (x ^ (3)) / (2) + 3 (x ^ (2)) / (2) + (7 ) / (4) ln (2x + 1) + C (D) (x ^ (2)) / (2) + 3 (x) / (2) + (7) / (4) ln (2x + 1) + C

If ( x- 3 )/5 - 2 = -1 , then x is equal to ( a ) 8 ( b) 3 ( c ) -7 ( d ) 2

f(x)=int(5x^8+7x^6)/(x^2+1+2x^7)^2dx , if f(0)=0 then find f(1)=1/k. Then k is