Find the exact value of the expression. 1. cos (arctan 3 / 4) 2. tan (arcos 3

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Find the exact value of the expression.
1. cos (arctan 3 / 4)
2. tan (arcos 3 / 5)
3. sec (arctan 12 / 5)
4. cot [ arcsin (12 / 13)]
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