Solve sin2(t)=7cos(t)\displaystyle {{\sin}^{{2}}{\left({t}\right)}}=-{7}{\cos{{\left({t}\right)}}} for all solutions 0t<2π\displaystyle {0}\le{t}<{2}\pi

t\displaystyle {t} =  

Give your answers accurate to 2 decimal places, as a list separated by commas