August 2018 0 18 Report
 \int\limits {cos 7x cos 3x dx
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\int cso7xcos3x dx  \\  \\ =  \frac{1}{2}\int (cos(7x+3x)+cos(7x-3x))dx \\  \\ = \frac{1}{2}\int (cos(10x)+cos(4x))dx \\  \\ = \frac{1}{2}(\frac{1}{10}sin(10x)+\frac{1}{4}sin(4x)) + C \\  \\ = \frac{1}{20}sin(10x)+\frac{1}{8}sin(4x) + C
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