Question

Prove that: cos2A cos(



2

) - cos3A cos(

9

2

) = sin5A sin(

5

2

)​

Answer 1

Answer:

not understand the question properly sorry

Answer 2

Answer:$cos2A\:cos\frac{A }{2}-cos3A\:cos\frac{9A}{2}=sin5A\:sin\frac{5A}{ 2}$Step-by-step explanation:Formula ...