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Prove that the minimum value of 3 cosx+4...

Prove that the minimum value of `3 cosx+4 sin x + 5 ` is 0.

A

5

B

6

C

7

D

None of these.

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MODERN PUBLICATION-TRIGNOMETRY-EXERCISE
  1. Find the value of 3(sinx-cosx)^(4)+6(sinx+cos x)^(2)+4(sin^(6)x+cos^(6...

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  2. A horse is tied to post by a rope. If the horse moves along circular p...

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  3. Prove that the minimum value of 3 cosx+4 sin x + 5 is 0.

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  4. Equation cos 2x + 7 = a (2-sin x) can have a real solution for :

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  5. Number of solutions of |x-1| = cos x is:

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  6. If A=sin^(2)theta+cos^(4)theta, then find all real values of theta.

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  7. Whentheta varies over the real numbers, the maximum value of cos theta...

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  8. In Delta ABC, if sin ^(2) A+sin ^(2) B =sin ^(3)C, then the triangle i...

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  9. If tan theta=1/ sqrt7, then ((cosec^2 theta-sec^2 theta)/(cosec^2 thet...

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  10. sin 47^@ + sin 61^@- sin 11^@- sin 25^@ =

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  11. The most general of theta satisfying tantheta+tan((3pi)/(4)+theta)=2 a...

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  12. In triangle ABC, s= (a+b+c)/2, then (b cos^2 frac (C)(2)+ c cos^2 frac...

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  13. If sin^4 x - cos^4 x = p, then which one of the following is correct ?

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  14. If cos theta < sin theta and theta lies in the first quadrant, then wh...

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  15. The angle of elevation from a point on the bank of a river of the top ...

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  16. If sin^2 x + sin^2 y = 1, then what is the value of cot (x + y) ?

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  17. What is the value of cos 10^@ + cos 110^@+ cos 130^@ ?

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  18. What is the value of tan (-1575^@) ?

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  19. For which acute angle theta cosec^2 theta= 3 sqrt3 cot theta-5?

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  20. If tan^2 theta=2 tan^2 phi+1, then which of the following is correct ?

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