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1. If tan 2A = cot (A - 18°), then the value of A is
A. 24°
B. 18°
C. 27°
D. 36°
2. The value of cos2 17° – sin2 73° is
A. 0
B. 1
C. -1
D. 3
3. If sec 4A = cosec (A-20°),where 4A is an acute angle , find the value of A
A. 12°
B. 22°
C. 62°
D. 82°
5. The value of cos θ cos(90° -θ) - sin θ sin (90° -θ) is:
A. 1
B. 0
C. -1
D. 2
7. If (2 θ + 450) and (300 - θ) are acute angles, the degree measure of θ satisfying sin(2θ + 450) = cos (300 -θ ) is
A. 15°
B. 80°
C. 30°
D. 20°
8. The value of is
A. 2
B. 0
C. 4
D. -2
9. If cos (40° + A) = sin 30°, the value of A is:
A. 60°
B. 20°
C. 40°
D. 30°
10.
A. 2cosec2(90°-A)
B. 2sec2(90°-A)
C. 2cot2(90°-A)
D. 2tan2(90°-A)
12. sin (60° + θ) - cos (30° - θ) is equal to (where (60° + θ) and (30° -θ ) are both acute angles):
A. 0
B. 2 cos θ
C. 1
D. 2 sin θ
14. The value of tan1°.tan2°.tan3°.......... tan89° is :
A. 2
B. 1
C. 1/2
D. 0
15. Using the ratio of complementary angles, the value of is
A. 2
B. 3
C. 1
D. 0
16. If x sin (90° - θ) cot (90°- θ) = cos (90° - θ) then x is
A. 0
B. -1
C. 2
D. 1
17. If A and B are the angles of a right angled triangle ABC, right angled at C, then 1+cot2A =
A. cot2B
B. sec2B
C. cos2B
D. tan2B
18. If tan 2A = cot (A - 18°), then the value of A is
A. 36°
B. 27°
C. 18°
D. 24°
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