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If y=(sec^(2)theta-tantheta)/(sec^(2)the...

If `y=(sec^(2)theta-tantheta)/(sec^(2)theta+tantheta)'`then

A

`1/3ltylt3`

B

`y!in[1//3,3]`

C

`-3ltylt-1/3`

D

none of these

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A
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OBJECTIVE RD SHARMA-TRIGONOMETRIC RATIOS AND IDENTITIES-Exercise
  1. For x in R, tanx+1/2tan""(1)/(2^(2))tan""(x)/(2^(2))+...+(1)/(2^(n-1...

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  2. If (tan3A)/(tanA)=k, then (sin3A)/(sinA)=

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  3. If y=(sec^(2)theta-tantheta)/(sec^(2)theta+tantheta)'then

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  4. If cosA=tanB, cos B=tanC, cosC=tanA, then sin A is equal to

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  5. If A(1)A(2)A(3)A(4)A(5) be regular pentgon inscribed in anunit circle....

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  6. If tanalpha is equal to the integral solution of the inequality 4x^2-1...

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  7. If (x)/(cos theta)=(y)/(cos(theta-(2pi)/(2)))=(2)/(cos(theta+(2pi)/(3)...

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  8. If cos A=3/4 then the value of sin(A/2) sin((5A)/2) is

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  9. The minimum value of 9tan^2theta+4cot^2theta is

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  10. If x(1),x(2),x(3),...,x(n) are in A.P. whose common difference is alph...

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  11. If asin^2x+bcos^2x=c,bsin^2y+acos^2y=d and atanx=btany then a^2/b^2=.....

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  12. If a (n+1)=sqrt((1)/(2)(1+a(n)))then cos((sqrt(1-a(0)^(2)))/(a(1)a(2)a...

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  13. If alpha,beta,gamma,delta are the smallest positive angles in ascendin...

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  14. The value of cosycos(pi/2-x)-cos(pi/2-y)cosx+sinycos(pi/2-x)+cosxsin(p...

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  15. If cosx-sinalphacotbetasinx=cosalpha,then tan""(x)/(2) is equal to

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  16. The expression cosec^(2)A cot^(2)A-sec^(2)A tan^(2)A-(cot^(2)A-tan^(...

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  17. If sin alpha -cos alpha = m, then the value of sin^6alpha+cos^6alpha i...

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

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  19. If cos(A-B)=3/5and tan A tanB=2, then

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

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