1. Use identities to find exactly value of each.  (a) cos75° (b) cos(-15°) (c) cos(-105°) (d) cos 105. (e) cos (pi/12)

Simplify without using a calculator. Tan(31 degrees) - cos(59 degrees) / cos (31 degrees) =

Use the cos(x+y) formula and unit circle angles to find the exact value if cos(105)

Use periodicity to first rewrite each expression as the same trigonometric function of an angle in [-T, π). Then use that angle to determine the exact value from the unit circle. If undefined, write DNE. sec(-25) = sec( csc (¹7) = csc ( sin(- 17 ) = sin([])=[ sec (³) = sec ( Use periodicity to first rewrite each expression as the same trigonometric function of an angle in [0, π). Then use that angle to determine the exact value from the unit circle. If undefined, write DNE. cot (37) = cot( tan (9) =tan(| =