Answer
$$\tan 1.2915 \approx 3.4868$$
Work Step by Step
$$\eqalign{
& \tan 1.2915 \cr
& {\text{using a calculator to find the value }}\left( {{\text{set the calculator in radians mode}}} \right) \cr
& {\text{then}}{\text{, we obain}} \cr
& \tan 1.2915 \approx 3.4868 \cr} $$