Question

Evaluate -
I want answer now.....

Answer 1

Its of the form: (a+b)^2 - (a-b)^2

(a+b)^2 - (a-b)^2 = a^2 + 2ab + b^2 - a^2 + 2ab - b^2 = 4ab
ATQ,
a= a/2b &&  b= 2b/a
So, our question reads as:
4 *a/2b *2b/a - 4 = 4*1 - 4 = 0
Hope it helps.

Answer 2

$(\frac{a}{2b } + \frac{2b}{a} + \frac{a}{2b } - \frac{2b}{a} \: ) (\frac{a}{2b } + \frac{2b}{a} - \frac{a}{2b } + \frac{2b}{a} \: ) \: - 4 \\ \frac{2a}{2b} \times \frac{4b}{a} - 4 \\ 4 - 4 = 0$