The Unit Circle - Simple Trigonometry

x = cos (, and y = sin (. Simple geometry (right triangles and pythagoras' formula) will help locate values for some angles such as 30(, 45( and 60(. Using symmetry on the unit circle you can find values for angles that are multiples of 30(, 45( and 60(. Your calculator will assist you for other angles. First quadrant values for cos ( and sin (. ................
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