trinixx18 trinixx18

13-04-2018
Mathematics

contestada

!!!! Which of the following is a step in evaluating: ∫ cos2 5x dx

A. 1+cos 10x/ 2dx
B. 1-cos 10x / 20dx
C. 1+cos 10x / 20dx
D. 1 - cos 10x / 2dx

Respuesta :

LammettHash LammettHash

13-04-2018

It follows from the double angle identity for cosine:

[tex]\cos^2(5x)=\dfrac{1+\cos2(5x)}2=\dfrac{1+\cos(10x)}2[/tex]

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