50 billion suns
Even gluttons can't eat forever. When black holes at the hearts of galaxies swell to 50 billion times the mass of our sun, they may lose the discs of gas they use as cosmic feedlots. Most galaxies host a supermassive black hole at their centre.
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It is difficult to say how accurate these devices are when used at home because most research on their effectiveness has been conducted in a laboratory setting.
<h3>What is a sentence?</h3>
A sentence can be defined as a group of words that is typically made up of a subject and predicate, which are used by a writer to convey a logical information to his or her audience (readers).
In this scenario, a sentence which best accomplishes this goal is re-writing the given sentence as "It is difficult to say how accurate these devices are when used at home because most research on their effectiveness has been conducted in a laboratory setting" because the important information are still present in the new sentence.
Read more on a sentence here: brainly.com/question/985037
let s=sin(x), c=cos(x)
s^2/c^2+s*csc(x)
=s^2/c^2+s/s (csc(x) = 1/sin(x), by definition of csc(x) )
=s^2/c^2+1
=s^2/c^2 + c^2/c^2
=(s^2+c^2)/c^2 (s^2+c^2=1, an identity)
=1/c^2
= sec^2(x) (by definition of sec(x) = 1/cos(x) )
Answer:
Skylar
16
Explanation:
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