19. If A, B, C are the angles of a triangle such that cot- A = 3 tan, then sin A, sin B,sin C are in 1) A.P 2) G.P. 3) .P. 4) A.G.P. Numerical value type questions 20. cos 56 + cos 58 - cos 66 -4 cos28 cos 29 sin 33 = 21. If a= then tan a tan 20 + tan 2a tan 40 + tan 4a tan a = 5TC 7T TO 22. If sin 18 -sin sin 18 18 1-4sin10 sin 70 2 sin10 23. The value of the expression 24. If cosa+ cos D 3 and sina+sin= 1 and e is the arithmetic mean of a and B, then sin 20+ cos 20 is equal to 25. If x,ye R satisfies (x+5) +(y-12) = (14), then the minimum value of Vx+,? is