Cos, it's deceiving
Calculus
Level
5
\[ \large I = \int_0^{\frac{\pi }{2}} \frac{\cos (8x) - \cos (7x)}{1 + 2 \cos (5x) } \text{ d}x \]
Evaulate \(\displaystyle 15I \).
by
Sudeep Salgia