Question

cot 2A=cos^2A-1/2 cot A​

Answer 1

cot2 A - cos2 A
= cos2 A/sin2 A - cos2 A
= (cos2 A - cos2 A sin2 A)/sin2 A
= cos2 A (1 - sin2 A)/sin2 A
= (cos2 A/ sin2 A) cos2 A 1 - sin2 A = cos2 A
= cot2 A cos2 A

Here’s the answer. But baat maan le 3 se zyaada question nahi honge boards mein. I gave boards prev year. I know it bruh