Question

Prove that:cos2a-cos3a/sin3a+sin2a=tan(a/2)

Answer 1

Step-by-step explanation:

-2Sin(5a/2)*Sin(-a/2) / 2Sin(5a/2)*Cos(a/2)

2Sin(5a/2)*Sin(a/2) / 2Sin(5a/2)*Cos(a/2)

Sin(a/2) / Cos(a/2)

tan(a/2)

hence proof

Answer 2

Answer:

Open identity cos A - cosB in numerator

And open SinA +Sin B in denominator