1-calculate-cos-x-n-x-2-x-1-dx-with-n-integr-natural-2-find-the-value-of-cos-x-2n-x-2-x-1-dx-3-calculate-cos-pi-x-3-

Question Number 34593 by abdo mathsup 649 cc last updated on 08/May/18

1) c a l c u l a t e \int_{- \infty}^{+ \infty} \frac{c o s (α x^{n})}{x^{2} + x + 1} d x w i t h n i n t e g r

n a t u r a l

2) f i n d t h e v a l u e o f \int_{- \infty}^{\infty} \frac{c o s (α x^{2 n})}{x^{2} + x + 1} d x

3) c a l c u l a t e \int_{- \infty}^{+ \infty} \frac{c o s (π x^{3})}{x^{2} + x + 1} d x