Working with unit circle in trigonometry through horizontal line, coterminal angles and allied angles

Find the values of the trigonometric functions in Exercises 6 to 10.

6. \sin 765°

7. cosec (-1410°)

8. \tan \frac{19 \pi}{3}

9. \sin \frac{-11 \pi}{3}

10. \cot \frac{-15 \pi}{4}