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The acute angle of a rhombus whose side ...

The acute angle of a rhombus whose side is a mean proportional between its diagonals is

A

`15^(@)`

B

`20^(@)`

C

`30^(@)`

D

`80^(@)`

Text Solution

Verified by Experts

The correct Answer is:
c
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MCGROW HILL PUBLICATION-TRIGONOMETRICAL IDENTITIES AND EQUATIONS -EXERCISE (LEVEL 2 Single Correct Answer Type Questions)
  1. The acute angle of a rhombus whose side is a mean proportional between...

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  2. Given the height h and the angle bisector l drawn from the vertex of t...

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  3. If 2sin^(2)(x+pi//4)+sqrt(3) cos2x gt 0, then

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  4. x=sum(n=0)^(oo)cos^(2n)theta, y=sum(n=0)^(oo)sin^(2n)theta, z=sum(n=0)...

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  5. The least positive value of x satisfying (sin^(2)2x+4sin^(4)x-4sin^...

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  6. cos7.5^(@)=

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  7. If x=X cos theta-Y sin theta, y=X sin theta+Y cos theta and ax^(2)+2b...

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  8. If sin 5 theta=a sin^(5) theta+bsin^(3)theta+c sin theta+d, then

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  9. If tan A-tanB=x and cotB-cotA=y, then the value of cot(A-B) is

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  10. (cos 3 theta)/(cos^(3)theta)+(sin 3 theta)/(sin^(3)theta) is equal to

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  11. (x tan alpha+y cot alpha) (x cot alpha+y tan alpha) -4xy cot^(2)2alpha...

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  12. If tanA, tanB, tanC satisfy the equation 3tan^(3)theta-4tan^(2)theta+3...

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  13. If x sin theta+y sin 2 theta+z sin 3 theta=sin 4 theta, (theta pi n pi...

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  14. The number of values of sin x satisfying sin 5 x =5 sin x is

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  15. If sin alpha, sin beta are the roots of the equation a sin^(2)theta+b ...

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  16. If sin (theta//2)=a, cos (theta//2)=b, then (1+sin theta)(3sin theta+4...

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  17. If sinA=sinB and cosA=cosB, A pi B, then

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  18. cos22^(@)+cos78^(@)+cos80^(@)=

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  19. tan x +(1)/(2) "tan"(x)/(2)+(1)/(2^(2))"tan"(x)/(2^(2))+….+(1)/(2^(n-1...

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  20. The value of (3+cot76^@cot16^@)/(cot76^@+cot16^@) is

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