HELP ME PLEASE

WHO IS KNOWLEGABLE WITH THIS?

ALSO CAN YOU JUST TYPE YOUR ANSWER THANK YOU

18.34. Suppose that @ is the acute angle between that two nonperpendicular intersecting lines L, and Lz have slopes m, and m2, respectively, then show that m tan 8 = 1 + millz 19.35. Use Problems 78 to find the acute angle 0 between the given pair of lines. (a) -x + 2y = 10,x +2y = -5 (b) x + 2y = 6,4x - 3y = 1 20.36. (a) Show that tan(tan"' + tan 12 + tan-13) = 0. (b) Discuss: How does the result in part (a) prove that tan"'1 + tan-12 + tan-13 = n