Question

Need help on number 17, trigonometric functions

Answer 1

Explanation:

we can use the equation

`n(sinu)(sinv)= (n)/(2) [cos(u-v)-cos(u+v)]`

Where

n = 16

u = 16x

v = 11x

We can substitute in these values to get the sum

`(16)/(2) [cos(16x-11x)-cos(16x+11x)]`

This can be simplified to

`8[cos(5x)-cos(27x)]`