Question: In Problems 4974, establish each identity. cot (a + 3) = 73 cotacot 3 - 1 cotcot a

In Problems 49–74, establish each identity.cot (a + 3) = 73 cotacot 3 - 1 cotcot a

cot (a + 3) = 73 cotacot 3 - 1 cotcot a

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