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If x= tan A - tan B , y= cot B- cot A "...

If ` x= tan A - tan B , y= cot B- cot A " then " (1)/(x)+(1)/(y)=`

A

`cot(A-B)`

B

`cot(B-A)`

C

`tan(A-B)`

D

`tan(B-A)`

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The correct Answer is:
A
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DIPTI PUBLICATION ( AP EAMET)-TRIGONOMETRIC RATIOS AND IDENTITIES -EXERCISE 1 B ( COMPOUNDS ANGLES )
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  12. cos 20^(@) + cos 100^(@) + cos 140^(@) =

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  13. sin 40^(@) - sin 80^(@)+ sin 160^(@)=

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  14. If A+B+C=0 , then tan A+ tan B+ tan C=

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  15. If A+B+C=0 , then cot A cotB + cot B cot C+ cot C cot A =

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  16. If A+C=B then tan A* tan B * tan C=

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  17. If A+B+C = pi //2 , then tanA tanB + tanB tanC+ tan A tan C=

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  19. If ABC are angle of a triangle then prove that cot Acot B+ cot Bcot C+...

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