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Q30. If 2 cos(A + B) = 1, and 2 sin(A –B) = 1 then the values of A and B are

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(a) 15°, 22° (b) 20°, 10° (c) 45°, 15° (d) 30°, 45°

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Class 10 Maths 8 months 1 Answer 1 views Enlightened 0

Q30. If 2 cos(A + B) = 1, and 2 sin(A –B) = 1 then the values of A and B are

Question

(a) 15°, 22° (b) 20°, 10° (c) 45°, 15° (d) 30°, 45°

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Class 10 Maths 8 months 1 Answer 2 views Enlightened 0

Q29.The value of cos2 17° – sin2 73° is

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(a) 0 (b) 1 (c) -1 (d) 3

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Q28. An observer √3 m tall is 3 m away from the pole 2 √3 m high. The angle of elevation of the top from the pole is :

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(a) 45° (b) 30° (c) 60° (d) 15°

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Class 10 Maths 8 months 1 Answer 1 views Enlightened 0

Q27. sin 2A = 2 sin A is true when A =

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(a)30° (b)45° (c)0° (d)60°

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Q26. In ∆ ABC, right-angled at B, AB = 24 cm, BC = 7 cm. The value of tan C is:

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(a)12/7 (b)24/7 (c)20/7 (d)7/24

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Class 10 Maths 8 months 1 Answer 1 views Enlightened 0

Q25. In ∆ ABC, right-angled at B, AB = 24 cm, BC = 7 cm. The value of tan C is:

Question

(a)12/7 (b)24/7 (c)20/7 (d)7/24

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Class 10 Maths 8 months 1 Answer 1 views Enlightened 0

Q24. The value of (tan1° tan2° tan3° … tan89°) is

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(A) 0 (B) 1 (C) 2 (D)1/2

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Class 10 Maths 8 months 1 Answer 1 views Enlightened 0

Q23.The value of the expression [cosec (75° + θ) – sec (15° – θ) – tan (55° + θ) + cot (35° – θ)] is

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(A) 1 (B) −1 (C) 0 (D) 1/2

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Q22. The value of sin θ and cos (90° – θ)

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(A) Are same (B) Are different (C) No relation (D) Information insufficient

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Class 10 Maths 8 months 1 Answer 2 views Enlightened 0

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class 10 trignometry