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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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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

User Ilyo
by
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1 Answer

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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
User Henrik Gering
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