Question

(csc β + cot β) (1-cos β) = sin β

Answer 1

(csc β + cot β) (1 - cosβ) = csc β - cot β + cot β - cos²β / sin
= 1/sin β - cos²β/sin β
= (1 - cos²β) / sin β
=sin²β /sin β
= sin β  (terbukti)