Question

3
Solve
4 Cos²c = 3 , (o< x < 360)​

Answer 1

Answer:

$Here, cos3x=4cosx−3cosx=0=cos(π2),$

Step-by-step explanation:

with the general solution

$3x=2kπ±π2,k=0,±1,±2,±3,..., giving$

$</p><p>x=(120k±30)o,k=0,±1,±2,±3,...</p><p></p><p>In [0,360o]</p><p></p><p>$

$</p><p>x=30o,90o,150o,210o,270oand330o$