Answer:
x < 20/3
(negative infinity, 20/3)
cos 2x – cosx = 0
------------ (1)
where cos2x = 2cos^2x –
1
equation (1) becomes;
<span>2cos^2x – 1 – cosx = 0 ------------ (2)</span>
Suppose cosx = y, then
equation (2) becomes;
2y^2 – 1 – y = 0
By factorization method;
(2y + 1) x (y – 1) = 0
Where 2y + 1 = 0 or y –
1 = 0
So solving both;
y = -1/2 or 1
As y = cosx
So cosx = -1/2 or 1
The above equation is true only for x = 2/3π, 0, 4/3 π
<span>The solution were find out for interval [0,2 π),
where 2 π is not included in the interval, as the interval is not a closed on
the right side.</span>
The simplified expression of is
<h3>How to simplify the expression?</h3>
The expression is given as:
Add the first two terms
Evaluate
Evaluate the first two terms
Evaluate
Take the LCM
Evaluate the like terms
Hence, the simplified expression is
Read more about expressions at:
brainly.com/question/723406
#SPJ1
Answer:
Ans; 58.80528
Step-by-step explanation:
Ans; ( 8.73) ( 42.1)(0.16) = (873) ( 421) (16) × 10^-⁵ = ( 367533) (16) × 10^-⁵ = 5880528 × 10^-⁵ = 58.80528
I hope I helped you^_^
The correct expression to convert the 22 AUD into USD is option A.
<h2>
How do you convert the Australian dollars into US dollars?</h2>
Given that the value of 1 US dollar is equal to the value of 2 Australian dollars. We can write this as given below.
1 USD = 2 AUD
1 AUD = 1/2 USD
The 22 Australian dollars can be converted as,
Hence the correct expression to convert the 22 AUD into USD is option A.
To know more, follow the link given below.
brainly.com/question/19943359.