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If f(x)=cos^2theta+sec^2theta, then f(x)...

If `f(x)=cos^2theta+sec^2theta,` then `f(x)<1` (b) `f(x)=1` `2>f(x)>1` (d) `f(x)geq2`

A

`y=0`

B

`y le2`

C

`y ge-2`

D

`y ne2`

Text Solution

Verified by Experts

The correct Answer is:
D
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OBJECTIVE RD SHARMA ENGLISH-TRIGONOMETRIC RATIOS AND IDENTITIES-Exercise
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  11. If x cosalpha+y sinalpha=2a, x cos beta+y sinbeta=2aand 2sin""(alp...

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  12. If tan x =(2b)/ (a- c), y = acos^2 x + 2bsin x cos x + csin^2 x, z=as...

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  13. If alpha+beta+gamma=2pi, then show that tan.alpha/2 + tan.beta/2 + tan...

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  14. If sintheta-costhetalt0, then theta lies between

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  15. Within what limits must A/2 lies if 2sinA/2=-sqrt(1+sinA)-sqrt(1-sinA)...

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  16. If 2cos""(A)/(2)=sqrt(1+sinA)+sqrt(1-sinA), thenA/2 iles between,

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  17. Find the angle theta whose cosine is equal to its tangent.

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  18. Prove that cos((2pi)/(15))cos((4pi)/(15))cos((8pi)/(15))cos((14pi)/(15...

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  19. Prove:cos(pi/15)cos((2pi)/15)cos((3pi)/15)cos((4pi)/15)cos((5pi)/15)co...

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  20. The value of tan 5 theta is

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