How do you evaluate sine, cosine, tangent of 300^circ without using a calculator?

1 Answer
Nghi N.
Jan 9, 2017

cos 300 = 1/2
sin 300 = - sqrt3/2
tan 300 = - (4sqrt3)/3

Explanation:

Use trig table of special arcs and unit circle -->
cos 300 = cos (-60 + 360) = cos (-60) = cos (60) = 1/2
sin 300 = sin (-60 + 360) = sin (-60) = - sin 60 = - sqrt3/2
tan 300 = sin/(cos) = (-2/sqrt3)(2/1) = -4/(sqrt3) = - (4sqrt3)/3

Related questions
See all questions in Trigonometric Functions of Any Angle
Impact of this question
7528 views around the world
You can reuse this answer
Creative Commons License