Verify the Identity Shown Below $$\tan ^ { 2 } \theta \sec ^ { 2 } \theta + \sec ^ { 2 } \theta = \sec ^ { 4 } \theta$$

Essay

Verify the identity shown below.
$$\tan ^ { 2 } \theta \sec ^ { 2 } \theta + \sec ^ { 2 } \theta = \sec ^ { 4 } \theta$$