This is a tutorial on how to use the sum and difference formulas to solve problems in trigonometry. For a list of these formulas, go here.
Find the exact value of sin(15o)
Solution to Example 1
Simplify cos(x - pi/2)
Solution to Example 2
Given sin x = 1 / 5 and sin y = -2 / 3, angle x is in quadrant II and angle y is in quadrant III, find the exact value of sin(x + y).
Solution to Example 3
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