Question

$\frac{1 - cos2a}{1 + cos2a} = {tan}^{2} a$
prove it

Answer 1

Hay mate its ur answer

$\frac{1 - cos2a}{1 + cos2a} \\ \\ = \frac{1 - (1 - 2 {sin}^{2} a)}{1 + (2 {cos}^{2} a - 1)} \\ \\ \frac{2 {sin}^{2} a}{2 {cos}^{2}a } \\ \\ = {tan}^{2} a$


Hence proved

Answer 2

$<marquee>✌️REFER TO THE ATTACHMENT ✌️$

In the attachment , tan^4 is proved , so check it out !