Question: #3 please show work 3. Find the exact value under the given conditions. sin a = 21 0> a> n ; 29 ~; Cos B

#3 please show work

3. Find the exact value under the given conditions. sin a = 21 0> a> n ; 29 ~; Cos B = 2, 0> B> Find cos (a + B). 2 O 24 145 O 144 145 O 17 145 O 143 145

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