Evaluate each of the following expressions by using special right triangles and the unit circle (give exact values), a. sin(4pi/3)
b. cos(11pi/3)
c. sin ( -5pi/6 )
d. cos (-2pi/3)

Find the perimeter of the triangle with vertices  d(3, 4),  e(8, 7), and  f(5, 9). do not round before calculating the perimeter. after calculating the perimeter, round your answer to the nearest tenth.  

Write the equations in logarithmic form 9^4=6,561

X+y ≥20 x≤2y a) (0,22) b) (7,11) c) ( 15,6) d) (10,10) e) (12,5) f) (8,16)