Find the exact value of the trigonometric expression given. Use the information provided. \text { 1) } \cos \theta=-\frac{5}{13} \text { where } \pi \leq \theta<\frac{3 \pi}{2} \text { 2)

} \tan \theta=-\frac{15}{8} \text { where } \frac{3 \pi}{2} \leq \theta<2 \pi \text { 3) } \tan \theta=-\frac{15}{8} \text { where } \frac{3 \pi}{2} \leq \theta<2 \pi \text { 4) } \sin \theta-\frac{1}{4} \text { where } \pi \leq \theta<\frac{3 \pi}{2}