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Brice Colon

Brice Colon

Answered question

2022-05-23

Integrate : 1 x 2 2 x x 2 d x

Answer & Explanation

a2g1g9x

a2g1g9x

Beginner2022-05-24Added 12 answers

I = 1 x 2 2 x x 2 d x
I = 1 x 3 2 x 1 d x
Substitute u = 1 x to get
I = u 2 u 1 d u
2 I = 2 u 1 + 1 2 u 1 d u
istremage8o

istremage8o

Beginner2022-05-25Added 4 answers

If x < 0 then 2 x x 2 does not make sense on R so I suppose that x > 0, we have
1 x 2 2 x x 2 d x = 1 x 2 1 ( x 1 ) 2 d x = x x 1 1 ( x + 1 ) 2 1 x 2 d x = x sin x 1 ( 1 + sin x ) 2 d x = x tan x 2 2 ( x 2 + 1 ) ( 1 + 2 x x 2 + 1 ) 2 d x = 2 1 + x 2 ( 1 + x ) 4 d x = 2 ( 1 ( x + 1 ) 2 2 ( x + 1 ) 3 + 2 ( x + 1 ) 4 ) d x = 2 3 ( 3 x 2 + 3 x + 2 ( x + 1 ) 3 ) + C = returning 2 x x 2 ( x + 1 ) 3 x 2 + C
Details of "returning":
2 3 ( 3 x 2 + 3 x + 2 ( x + 1 ) 3 ) + C = sec 2 x 2 ( 3 sin x + cos x 5 ) 3 ( tan x 2 + 1 ) 3 + C = ( 3 sin sin 1 x + cos sin 1 x 5 ) sec 2 1 2 sin 1 x ) 3 ( tan 1 2 sin 1 x + 1 ) 3 + C = 2 ( 1 x 2 + 1 ) 2 ( 1 x 2 3 x 5 ) 3 ( 1 x 2 + x + 1 ) 3 + C = 2 ( ( x 2 ) x + 1 ) 2 ( 3 x + ( x 2 ) x 2 ) 3 ( x + ( x 2 ) x ) 3 + C = 2 x x 2 ( x + 1 ) 3 x 2 + C

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