How to Solve Trig Ratios of General Angles? (+FREE Worksheet!)
Trig Ratios of General Angles – Example 1: Find the trigonometric function: \(cos\) \(120^\circ\) Solution: \(cos\) \(120^{\circ}\) Use the following property: \(cos\)\((x)=\) \(sin\)\((90^{\circ}-x)\)\(cos\) \(120^{\circ} =\) \(sin\) \(( 90^{\circ} -120^{\circ})=\) \(sin ( -30^{\circ}) \) Now use the following property: \(sin (-x)\)\(=- sin (x)\) Then: \(sin ( -30^{\circ})=-sin (30^{\circ}\))\(=-\frac{1}{2 }\) The Absolute Best Books to Ace Pre-Algebra […]