19. If A, B, C are the angles of a triangle such that cot- A =...

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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) Н.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+ cosß D 3 and sina+sinß= 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 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) Н.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+ cosß D 3 and sina+sinß= 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