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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

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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1 vote
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

asked
User Ilyo
by
8.1k points

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
answered
User Henrik Gering
by
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