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Talja [164]
3 years ago
14

What are all the exact solutions of square root2 cosx -1 = 0 for 0 <= x <= 2pi? Give you answer in radians.

Mathematics
2 answers:
nadya68 [22]3 years ago
7 0

Answer:

Option 2 - x=\frac{\pi}{4},\frac{7\pi}{4}  

Step-by-step explanation:

Given : Expression \sqrt{2}\cos x-1=0 for 0\leq x\leq 2\pi              

To find : What are all the exact solutions of expression?

Solution :  

First we simplify the expression,

\sqrt{2}\cos x-1=0

\sqrt{2}\cos x=1            

\cos x=\frac{1}{\sqrt{2}}      

The general solution is            

x=\frac{\pi}{4}+2\pi n,\frac{7\pi}{4}+2\pi n          

For 0\leq x\leq 2\pi                  

The solution is  x=\frac{\pi}{4},\frac{7\pi}{4}  

Therefore, Option 2 is correct.

Allushta [10]3 years ago
4 0

Answer:

pi/4 and 7pi/4

Step-by-step explanation:

attached

you're welcome :>

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