Please solve: sec^2 x=tanx+3

sec^2x=tanx+3
sec^2x= tan^2x+1
tan^2x+1=tanx+3
tan^2x+tanx-2=0
(tanx-2)(tanx+1)=0
tanx=2, tanx=-1
x= 1.107 rad or 0.7854 rad