Trigonometric equation.
${\mathrm{cos}}^{2}x-{\mathrm{sin}}^{2}x=\mathrm{cos}3x$
You can still ask an expert for help

• Questions are typically answered in as fast as 30 minutes

Solve your problem for the price of one coffee

• Math expert for every subject
• Pay only if we can solve it

lavarcar2d2

where $n\in \mathbb{Z}$
The second case includes the first case. $2\pi n=\frac{2\pi \left(5n\right)}{5}$
###### Did you like this example?
Jared Lowe
$\mathrm{cos}3x=\mathrm{cos}x\mathrm{cos}x-\mathrm{sin}x\mathrm{sin}x=\mathrm{cos}2x,$
which is equivalent to
$3x±2x=2k\pi$
for some integer $k$.