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

Cesar Mcconnell

Today, 15:09

+1

Answers (1)

Know the Answer?

Saniya Shepherd · 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