c) log59log, 125 d) 7log79 12. Solve: a) 35x_ 1 81 b) 2x-1=5 13. Solve: a) log (x2 - 2)=1 b) log73-log7X = 5 14. Find the exact value for: a) tan 27 b) sin 1110 15. Verify the identities: a) csc x -sin x = cos x . cot x tan20 1-cose b) 1+seco cose 16. Find the exact value of: a) sin -1(tan(-?)) b) sin(cos -1(-2) ) 18. Use the values cos(x) = - 3/5, sin(x) > 0 to find the values of all six trigonometric functions. 19. During a figure skating routine, Jack and Ana skate apart with an angle of 20 between them. Jack skates for 7 meters and Ana skates for 4 meters. How far apart are the skaters? 20. Two observers are standing on shore 3 miles apart at points A and B and measure the angle to a sailboat at a point C at the same time. Angle A is 590 and angle B is 480. Find the distance from observer A to the sailboat