Question

please solve the question guys

Answer 1

ur questions is incomplete.

Answer 2

As <CAB=60
⇒<COB=120 (class 9th theorem)
and
OC=OB
⇒<OCB=<OBC=x (angles opposite to equal sides are equal)
<OCB+<OBC+<COB=180  (angle sum property)
2x+120=180
2x=180-120
x=60/2
x=30