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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
A phone company charges $1.00 for the first three minutes of a long-distance call and $0.30 each for additional minute. A 4% federal tax is then added to the coast of the call. Find the total cost of a 23 minute call.
5/3x + 3/x = 1