Find the range of x :
From the graphical method , i got ,
My question is how to do it algebraically , i mean without the graphical method ??
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Divide by 2: .
If then the inequality can be written as .
On the interval cosine is decreasing. Then
Substract from all terms and you'll get
If then we have
Cosine is increasing, then
Thanks .But how come when you say the cosine is decreasing, you just swap the positions of pi/3 and pi/6 ??
If a function f is decreasing then
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