Given that sin 0 =-- and 0 lies in quadrant IV, find the exact value of cos

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A: Trigonometry

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Q: If cos u = 2425 and u is in quadrant IV, fnd the other fve trigonometric functions of u.

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Q: What is the exact value of cos- (sin a) where a = 13T radians? 4

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Ratios

A ratio is a comparison between two numbers of the same kind. It represents how many times one number contains another. It also represents how small or large one number is compared to the other.

Trigonometric Ratios

Trigonometric ratios give values of trigonometric functions. It always deals with triangles that have one angle measuring 90 degrees. These triangles are right-angled. We take the ratio of sides of these triangles.