Trigonometric Function                   Trigonometric Functions (Right Triangle)               Special Angles             Trigonometric Function Values in Quadrants II, III, and IV              Examples:             Example2:               Example: 3:                Unit Circle                Addition Formulas:       cos(X+Y) = cosXcoxY – sinXsinY  cos(X-Y) = cosXcoxY + sinXsinY  sin(X+Y) = sinXcoxY + cosXsin  sin(X-Y) = sinXcoxY – cosXsinY  tan(X+Y) = [tanX+tanY]/ [1– tanXtanY]  tan(X-Y) = [tanX-tanY]/ [1+ tanXtanY]  cot(X+Y) = [cotX+cotY-1]/ [cotX+cotY]  cot(X-Y) = [cotX+cotY+1]/ [cotX-cotY]     Sum to Product Formulas:       cosX + cosY = 2cos [(X+Y) / 2] cos[(X-Y)/2]  sinX + sinY = 2sin [(X+Y) / 2] cos[(X-Y)/2]     Difference to Product Formulas       cosX - cosY = - 2sin [(X+Y) / 2] sin[(X-Y)/2]  sinX + sinY = 2cos [(X+Y) / 2] sin[(X-Y)/2]       Product to Sum/Difference Formulas       cosXcosY = (1/2) [cos (x-Y) + cos (X+Y)]  sinXcoxY = (1/2) [sin (x+Y) + sin (X-Y)]  cosXsinY...
 
 
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