Given
[tex]7cos\text{ \lparen2t\rparen=3}[/tex][tex]\begin{gathered} cos(2t)=\frac{3}{7} \\ \\ \end{gathered}[/tex][tex]\begin{gathered} 2t=1.128\text{ ,5.5.155} \\ divide\text{ by 2} \\ t=0.564,2.578 \end{gathered}[/tex]The final answer
[tex]t=0.56,\text{ 2.58}[/tex]