book Maths Puzzle Numerical Ability

simplify these expressions:

(2cotB)/(1+cot^B)

the answer is supposed to be 2cosBsinB but i have no idea how that occurs.

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book Other Question

What is complementary angle What is 8,000,000,000,000 and also 104,300,000,000 written in scientific notation? My teacher made up a worksheet for us and I am having trouble with these.

Thanks so much for your help
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