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2 sec^(2) theta - sec^(4) theta - 2 "cos...

`2 sec^(2) theta - sec^(4) theta - 2 "cosec"^(2) theta + " cosec"^(4) theta =`

A

`cot^(4) theta - tan^(4) theta `

B

`sec^(4) theta - " cosec "^(4) theta `

C

`sin^(4) theta- cos^(4) theta `

D

`sec^(4) theta - cot^(4) theta `

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The correct Answer is:
A
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DIPTI PUBLICATION ( AP EAMET)-TRIGONOMETRIC RATIOS AND IDENTITIES -EXERCISE 1 A ( TRIGONOMETRIC FUNCTIONS)
  1. "cosec"^(2) theta * cot^(2) theta -sec^(2) theta * tan^(2) theta - (co...

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  2. sec^(2)A tan^(2) B-tan^(2)A sec^(2) B=

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  3. 2 sec^(2) theta - sec^(4) theta - 2 "cosec"^(2) theta + " cosec"^(4) t...

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  4. sin^(2) alpha * tan alpha + cos^(2) alpha * cot alpha + 2 sin alpha co...

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  5. If (sin alpha + "cosec" alpha )^(2) + ( cos alpha + sec alpha )^(2)=k+...

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  6. sin^(2) A cos^(2)B + cos ^(2) A sin^(2) B + sin^(2) A sin^(2) B+ cos^(...

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  7. If sin A , cos A and tan A are in G.P. then cot^(6) A- cot^(2) A =

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  8. ( sec theta + tan theta -1)/( tan theta - sec theta +1)

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  9. (cot theta + " cosec " theta -1)/(cot theta - " cosec " theta +1)=

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  10. cot^(2) theta ((sec theta -1)/(1+ sin theta ))+ sec^(2) theta ((sin th...

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  11. (2 sin theta * tan theta (1- tan theta ) + 2 sin theta sec^(2) theta )...

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  12. ((1+ sin theta - cos theta )/( 1+ sin theta + cos theta ))^(2)=

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  13. (1)/(sec alpha - tan alpha ) - (1)/( cos alpha)=

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  14. (1)/(sec^(4) alpha ) +(1)/("cosec"^(4) alpha ) +(2)/(sec^(2) alpha + ...

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  15. (cos A)/( 1+ sin A) +(cos A)/( 1-sin A )=

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  16. ( tan theta)/( sec theta -1)-(tan theta )/( sec theta + 1)=

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  17. The expression (tan A)/(1- cot A) + ( cot A )/( 1- tan A) can be writt...

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  18. (cos theta )/( sec theta + tan theta ) + ( cos theta )/( sec theta - t...

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  19. (tan A + tan B)/( cot A + cot B)+(1- tan A tan B)/( 1- cot A cot B)=

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  20. ( sec theta + tan theta )/("cosec " theta + cot theta ) -(sec theta - ...

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