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Question
`"cos"["tan"^-1 1/3 + "tan"^-1 1/2]` = ______
Options
`1/sqrt2`
`sqrt3/2`
`1/2`
`pi/4`
Solution
`"cos"["tan"^-1 1/3 + "tan"^-1 1/2] = \underline(1/sqrt2)`
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