Review the proof of the identity cos(π − A) = −cosA.
2 answers:
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Answer:
Step-by-step explanation:
1. regroup terms
2. Rewrite as
and 343 as
3. Since both terms are perfect cubes, factor using the sum of cubes formula, , where
and
4. Factor out of
5. Regroup
6. Factor again
Answer:
Option 1:(x-4)^2+y^2=100
Step-by-step explanation:
Given center = (h,k) = (4,0)
The point (-2,8) lies on circle which means the distance between the point and center will be equal to the radius.
So,
The distance formula will be used:
Hence radius is 10.
The standard form of equation of circle is:
(x-h)^2+(y-k)^2 = r^2
Putting the values
(x-4)^2+(y-0)^2=10^2
(x-4)^2+y^2=100
Hence option 1 is correct ..