50 points! reduce the fraction to lowest terms. m²/m² - n² a. m/(m + n)(m - n) b. m²/(m+n)² c. m²/(m + n)(m - n)

< coa = 150 ( given)

as ba and bc are tangents

so oc and oa is perpendicular to cb and ab respectively because in circle normal passes through centre

so in quadrilateral oabc

< coa + < oab + < ocb + < abc = 360

150 +90+90 + < abc = 360

330 + < abc = 360

< abc = 360 -330 = 30

so < abc = 30

⭐dhruv⭐