Question: Help Dr. Zelinsky write a problem. He wants to write a trig identity problem for his students. He'd like the left-hand side of the identity


Help Dr. Zelinsky write a problem. He wants to write a trig identity problem for his students. He'd like the left-hand side of the identity be the quantity cost?, and the . COST right-hand side to only use tan x. Help him out by finding such a identity. COS ( X + 4 COS X
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