Verify the Identity $$\frac { \tan ^ { 2 } x } { \sec x + 1 } = \frac { 1 - \cos x } { \cos x }$$

Multiple Choice

Verify the identity. $$\frac { \tan ^ { 2 } x } { \sec x + 1 } = \frac { 1 - \cos x } { \cos x }$$

A) valid
B) invalid