![n(sinu)(sinv)= \frac{n}{2} [cos(u-v)-cos(u+v)]](/tpl/images/0319/6956/53340.png)
![\frac{16}{2} [cos(16x-11x)-cos(16x+11x)]](/tpl/images/0319/6956/89975.png)
![8[cos(5x)-cos(27x)]](/tpl/images/0319/6956/bf93f.png)
Need on number 17, trigonometric functions
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