Help please !!

would like an explanation on it too if not much work

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What basic trigonometric identity would you use to verify that csc x sec x cot x = csc^(2)x

There were 816 people at a concert when a band started to play. after each song, only half the people stayed to hear the next song. how many people were left at the concert after x songs? write a function to represent this scenario.

Issof claims that the scale factor is 1/2. which statement about his claim is correct