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If cos A = (sin B)/(2 sin C) , then Delt...

If `cos A = (sin B)/(2 sin C)` , then `Delta ABC` is

A

an equilateral triangle

B

a right angled triangle

C

an isosceles triangle

D

an isosceles right angled triangle

Text Solution

Verified by Experts

The correct Answer is:
C
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NAVNEET PUBLICATION - MAHARASHTRA BOARD-QUESTION BANK 2021-TRIGONOMETRIC FUNCTIONS
  1. The principal solution sqrt(2)secx-2=0 are

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  2. If cos A = (sin B)/(2 sin C) , then Delta ABC is

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  3. If sin^(-1)x-cos^(-1)x=(pi)/(6), " then :" x=

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  4. The principal value of sin^(-1)(1/2) is

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  5. Find the principal value of: cos^(-1)(-1/2)

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  6. In Delta ABC, if angle A = 30^(@), angle B = 60^(@), then the ratio of...

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  7. In Delta ABC, if b^(2) + c^(2) - a^(2) = bc, then angle A = .

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  8. If polar co-ordinates of a point are ((3)/(4), (3pi)/(4)), then its Ca...

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  9. tan^(-1)(tan""(7pi)/(6))

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  10. If sin(sin ""^(-1) [(1)/(5)] + cos^(-1) x) = 1,then x is

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  11. Evaluate cot (tan^(-1) (2x) + cot^(-1) (2x))

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  12. In any triangle ABC prove that: c cos B-bc cos A=a^2-b^2

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  13. In Delta ABC, if sin^(2)A + sin^(2)B = sin^(2)C, then show that a^(2) ...

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  14. The polar co-ordinates of the point whose cartesian co-ordinates are (...

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  15. Prove that 2 tan^(-1) ((3)/(4)) = tan^(-1) ((24)/(7))

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  16. Evaluate sin[cos^(-1) ((3)/(5))]

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  17. In Delta ABC, a = 3, b = 4 and sin A = (3)/(4), find angle B.

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  18. Find the principal solutions of cosec x = 2.

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  19. Find the general solutions of sin x - 1 = 0

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  20. Find the Cartesian co-ordinates of point whose polar co-ordinates are ...

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