Answer:
Explanation:
Consider the RHS:
cot(β)-cot(β)(cos^2(β)=sin(β)cos(β)
Factor cot
cot(β)(1-cos^2(β)=sin(β)cos(β)
Use Pythagorean Idenity
cot(β)(sin^2(β)= sin(β)cos(β)
Simplify cot(β)= sin(β)cos(β)
(cos(β)/sin(β))(sin(β)sin(β)= sin(β)cos(β)
sin(β)cos(β)=sin(β)cos(β)
QED