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

Question

Maleah Mathews

19 October, 12:15

+5

Answers (1)

Know the Answer?

Amya Sharp · Answer 1

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

How do I do this?Express the following as trigonometric ratios of either 30, 45 or 60 degrees and hence find their exact valuesA) sin120B) cos225C) tan390