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Show that the equation sec^2 theta=(4xy)...

Show that the equation `sec^2 theta=(4xy)/(x+y)^2` is only possible when x=y

A

`x = y`

B

` x gt y`

C

` x lt y`

D

None of these

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The correct Answer is:
A
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DISHA PUBLICATION-TRIGONOMETRIC FUNCTIONS -EXERCISE-1
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  2. Radian measure of 40^(@)20' is equal to

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  3. Show that the equation sec^2 theta=(4xy)/(x+y)^2 is only possible when...

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  4. if sin^2theta=(x^2+y^2+1)/(2x) then x must be

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  5. Find the angle in radian through which a pendulum swings if its length...

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  6. Which among the following is/are true ? I. The values of cosec x re...

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  7. The minute hand of a watch is 1.5 cm long. How far does its tip move ...

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  8. if 0<=x<=pi and 81^(sin^2x)+81^(cos^2x)=30 then x=

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  9. The range of the function f(x) = (1)/(2-sin 3x) is

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  10. The range of f (x) cos "" (pi [x])/(2) is

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  11. If (cos A)/3= (cos B)/3 = 1/5, - pi/2 lt A lt 0 and - pi/2 lt B lt 0 ...

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  12. If tan theta + sec theta = p, then what is the value of sec theta ?

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  13. If sin q + cosecq =2, then the vlaue of sin ^(6) q + cosec ^(6) q is e...

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  14. Find the radius of the circle in which a central angle of 60^(@) inter...

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  15. If cos theta = - 3/5 and pi lt theta lt 3pi/2, find the value of (sec ...

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  16. The range of f(x) = cos x - sin x is

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  17. If sin x + cos x = 1/5, then tan 2x is

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  18. The least values of ( sin ^(2) theta+ cosec ^(2) theta) is

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  19. The maximum value of [sin (x+(pi)/(6))+cos (x+(pi)/(6))] in the interv...

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  20. The expression (cos 6x+6cos 4x+15 cos 2x+10)/(cos 5x+5 cos 3x+10 co...

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