Let x be an angle measure and let the real numbers a, b, c, cos x be such that they make the following equation true: .2 a cos“ x +b cos x + c= 0 Write the equivalent quadratic equation for a, b, c, cos 2x. Compare the given and the obtained equality for 2, с a = 4, b = 2,°c =-1.

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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.