Exercises 21-28: (Refer to Example 4.) Find the following. (a) sin(a + B) (b) cos (a + B) (c) tan (a + B) (d) The quadrant containing a + B 21. sina = 3 · } and sinß = √3, a and ß in quadrant I 22. cosa = - and cosß = -13, & and ß3 in quadrant II 13 a

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