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For two angles, a and ß, it is known that < a < and 180° < B < 270°. If cos a
--and sin ß-
-3, find the following values in exact, simplest form.
Find cos (a-B) using a sum or difference identity.
O-6√2-4
15
O 6√2-4
15
O-6√2+4
15
1-
O 6√2+4
15


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For two angles a and ß it is known that lt a lt and 180 lt B lt 270 If cos a and sin ß 3 find the following values in exact simplest form Find cos aB using a su class=


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