1. Use our book's angle restrictions (see above) to find the values of (be sure to make clear whether your values are in units of radians or degrees) (a) cot (-3/4) (b) sec (-12/7) 2 3. Show why each identity is true: 1 - tan20 2. 1 + tan20 + 2 sin2 0 = 1 3. sind + cos0 - cos" 0 = tan 0+ sin-0 cos d 4 5. Use the angle addition & subtraction formulas to find simplified exact, expansions for 1 . sin ( 0 + 47 ) + sin ( 0 - 2 ) 5. 120 cos (0 + tan ' () ) 6. Rewrite 8cosr-5sinc in the format ksin(r+$)