INTRODUCTORY EXERCISES
(3) Use the even-odd identities to simplify the expressions.
(a) cos(-2x)
(b) tan(-
/4)
(c) sin(-4/3)
SOLUTION:
(a) cos(-2x) = cos2x
(b) tan(-/4) = -tan(/4)
(c) sin(-4/3) = -sin(4/3)
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