Question

(csc β + cot β) (1-cos β) = sin β

Answer 1

(1/sin β + cos β/sin β) (1-cos β) = sin β
(1+ cos β) (1-cos β) / sin β = sin β
(1 - cos² β)/ sin β = sin β
sin² β / sin β = sin β
sin β = sin β (terbukti)