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If sintheta+cosectheta=2 then sin^ntheta...

If `sintheta+cosectheta=2` then `sin^ntheta+cosec^ntheta=`

A

2

B

1

C

3

D

none of these

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The correct Answer is:
A
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PATHFINDER-TRIGONOMETRIC RATIOS AND IDENTITIES-QUESTION BANK
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  3. If sintheta+cosectheta=2 then sin^ntheta+cosec^ntheta=

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  5. 4sin^2x +4cos^2xgek then k is

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  6. If sin A,cos A and tan A are in G.P. then cos^3A+cos^2A is equal to

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  7. If x+1/x=2costheta then x^3+1/x^3=

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  8. If A=sin^2theta+cos^4theta then for all real values of theta

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  12. The value of sin 10^@+sin 20^@+sin30^@+…..+sin360^@ is equal to

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  13. if sin^4alphacos^2alpha=underset(k=0)overset3sum ckcos2kalpha then c1+...

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  19. sec^2theta=4xy/(x+y)^2 is true if and only if

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  20. If tanx=(2b)/(a-c), (a ne c) y=acos^2x+2bsinxcosx+csin^2x and z=asin...

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