integral dari (a) ∫ cos⁡(2x-1)dx (b) ∫ dx/(2x+3)

Posted by andi telaumbanua on Feb 17, 2018 in Matematika |

Tentukanlah Integral berikut:

  1. ∫ cos⁡(2x-1)dx

  2. ∫ dx/(2x+3)

Jawab:

1. Misalkan: u = 2x-1

Maka: du/dx = 2

Sehingga: dx = du/2

∫ cos⁡(2x-1) dx = ∫ cos⁡u du /2 = 1/2 ∫ cos⁡ u du = 1/2 ( sin⁡ u ) + C = 1/2 sin⁡(2x-1) + C

2. Misalkan: u = 2x+3

Maka: du/dx = 2

Sehingga: dx = du/2

∫ dx /(2x+3) = ∫ (1 /u) (du/2) = 1/2 ∫ du / u = 1/2 ln⁡|u| +  C =  1/2 ln⁡|2x + 3| +  C

 

 

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Tentukanlah Integral berikut:

1. ∫ cos⁡(2x-1)dx

2. ∫ dx /(2x+3)

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