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If cotx=(a)/(b), find the value of a cos...

If `cotx=(a)/(b)`, find the value of a `cos2x+b sin 2x`

A

a

B

b

C

sina

D

a/b

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The correct Answer is:
A
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QUANTUM CAT-TRIGONOMETRY-QUESTION BANK
  1. find the value of expression (sin2x)/(1+cos2x) is:

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  2. find the value of the following expression cos^4theta-sin^4theta is :

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  3. If cotx=(a)/(b), find the value of a cos2x+b sin 2x

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  4. Find the value of cot3theta:

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  5. Find the value of sin(22 1/2)^@ :

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  6. If 2 cos theta=x+(1)/(x), find the value of 2cos 3 theta

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  7. Find the value of tanA+tanB+tanC, if A+B+C=pi:

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  8. If cos B=(sinA)/(2sinC), find the nature of triangle :

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  9. If the angles of a triangle are in the ratio 1:2:3 and its circumradiu...

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  10. If a=1, b=sqrt3 and angleA=30^(@), find the value of the angle B:

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  11. Find B and C of a triangle ABC, if b = 2 cm, c = 1 cm and A=60^(@).

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  12. In a triangle ABC, a=1cm, b=sqrt3 and C=(pi)/(6), find the third side ...

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  13. If the angles of a triangle are in the ratio 1:2:3, find the ratio bet...

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  14. If a=2b and A=3B, find the angles A, B, C of DeltaABC :

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  15. If in any triagnle a=13cm, b= 14 cm and c = 15cm, find the inradius of...

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  16. In a right angled triangle a^2+b^2+c^2 is :

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  17. Abhinav and Brijesh started walking simultaneously @ 3 km/h and 4 km/h...

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  18. From the top of a tower 180 m high, it was observed that the angle of ...

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  19. The angle of elevation of the top a building at a distance of 100 m fr...

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  20. A person standing on the bank of a river observes that the angle subte...

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