book Maths Puzzle Numerical Ability

i want to know all the formulas of cos

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book Other Question

How do you identify the location(axis or quadrant) of each point listed?

( Example = 2,-2 is in Quatrant IV 2,0 is on the X axis. One garden hose can fill an above-ground pool in 10 hours. A second hose can fill the pool twice as fast as the first one. If both hoses are used together to fill the pool, how many hours will it take?