Trigonometry (Railway Maths) (Part – VI)

Total Questions: 31

21. What will be the value of cos4x: [ALP Tier II 21/01/2019 (Afternoon) ]

Correct Answer: (d) 1 - 8sin 2 x cos²x
Solution:

22. cos(45°+ x) + cos(45°- x) = ? What will be the value of [ALP Tier II 21/01/2019 (Afternoon) ]

Correct Answer: (b) √2 cosx
Solution:

23. if sinx = 5/13, then what is the value of cot x? [ALP Tier II 21/01/2019 (Afternoon) ]

Correct Answer: (c) 12/5
Solution:

24. If cot⁴θ + cot²θ = 3, then cosec⁴θ - cosec²θ = ? [RRB ALP 09/08/2018 (Afternoon) ]

Correct Answer: (d) 3
Solution:

25. Find the answer of given equation? [RRB ALP 10/08/2018 (Morning) ]

Correct Answer: (d) 60°
Solution:

26. If tanα = √2 - 1 then the value of tanα - cotα = ? [RRB ALP 13/08/2018 (Evening) ]

Correct Answer: (c) -2
Solution:

27. If tan⁴θ + tan²θ = 2, then sec⁴θ - sec²θ =? [RRB ALP 14/08/2018 (Evening) ]

Correct Answer: (a) 2
Solution:

28. Sinθ cos(90° - θ) + cosθ sin(90° - θ) = ? [RRB ALP 20/08/2018 (Evening) ]

Correct Answer: (d) 1
Solution:

29. If sin x + cos x = √2 sin x the the value of tan x is: [RRB ALP 21/08/2018 (Afternoon) ]

Correct Answer: (b) √2 + 1
Solution:

30. A right-angled triangle ABC is right-angled at B, and tan A = 4/3. If AC = 25 cm, the length of BC is: [RRB ALP 31/08/2018 (Afternoon) ]

Correct Answer: (b) 20 cm
Solution: