Which equation correctly describes the relationship between the measures of the angle and arcs formed by the intersecting secant and tangent?

m∠1=1/2(mjk−mkl)
m∠1=1/2(mjk+mkl)
m∠1=1/2mjk
m∠1=mjk−mkl

Angle m∠1 if formed by a tangent and  secant intersecting outside of circle. The intercepted arcs are arc LK and arc JK.
Thus;
Angle formed by Tangent and secant 
=1/2(DIFFERENCE of Intercepted Arcs)
m∠1=1/2(mJK-LK)

m∠1=1/2(mJK-KL)