How do you find the integral of $cos (5 x)$ $cos(5x)$ ?

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Answer 1 · 2018-04-14T16:12:05

Let $5 x = t$ $5x=t$
$\Rightarrow d t = 5 d x$ $=> dt= 5dx$

$\int cos (5 x) d x$ $intcos(5x)dx$

$\Rightarrow \int cos t \frac{d t}{5}$ $=>intcost(dt)/5$

$\Rightarrow \frac{sin t}{5} + c$ $=> sint/5 + c$

$\Rightarrow \frac{sin (5 x)}{5} + c$ $=> sin(5x)/5 + c$

How do you find the integral of cos(5x)cos(5x)cos(5x)?