Prove the following :
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see below

Step-by-step explanation:

we are given

we want to prove it algebraically

to do so rewrite 30:

let 29 be a thus substitute:

factor the denominator:

Factor out a²:

factor out 1:

group:

reduce fraction:

substitute back:

simplify substraction:

hence Proven

< 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⭐

answer: i don't understand. what are the options

step-by-step explanation: