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9 January, 02:11

How do I do this?

Express the following as trigonometric ratios of either 30, 45 or 60 degrees and hence find their exact values

A) sin120

B) cos225

C) tan390

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Answers (1)
  1. 9 January, 02:34
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    A sin120 = 2 sin60 cos 60 = 2 * sqrt3/2 * 1/2 = sqrt3/2

    B. cos 225 = - cos 45 = - 1 / sqrt2

    C tan 390 = tan 30 = 1 / sqrt3
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