Find the exact value of trigonometric ratios  Trigonometric Ratios and Angle Measures
Find the exact value of trigonometric ratios
Basic concepts:
 Solving expressions using 454590 special right triangles
 Solving expressions using 306090 special right triangles
 Reference angle
 ASTC rule in trigonometry (All Students Take Calculus)
Related concepts:
 Sine graph: y = sin x
 Cosine graph: y = cos x
 Tangent graph: y = tan x
Lessons

1.
Find the exact value of all six trigonometric ratios, then make a conclusion
which primary trigonometric ratios (sin $\theta , cos \theta, tan \theta$) are positive in each
quadrant