Find all solutions to the equation with 0 is less then or equal to a is less then or equal to 2pi Give an exact answer if possible, otherwise give value(s) ofa accurate to at least four decimal places.

Question

Find all solutions to the equation with 0 is less then or equal to a is less then or equal to 2pi  Give an exact answer if possible, otherwise give value(s) ofa accurate to at least four decimal places. 
4tan(a)+5=2
a=
how do i find a

Steve · Answer

you can find a by noting that tan(a) = -3/4 There will be a solution in QII and QIV