\text { 6. Simplify }(\tan \theta-\sec \theta)^{2} \text {. } \frac{\sin \theta-1}{1+\sin \theta} \tan ^{2} \theta-\sec ^{2} \theta \text { 36. Simplify }{ }^{(\tan \theta-\sec \theta)^{2}} \text {. }

Fig: 1

Fig: 2

Fig: 3

Fig: 4

Fig: 5

Fig: 6

Fig: 7