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cos theta - cos (60^(@) + theta ) - cos(...

`cos theta - cos (60^(@) + theta ) - cos(60^(@) - theta )= `

A

0

B

1

C

`1//4`

D

`3//4`

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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 )
  1. cos theta + cos (240^(@) + theta ) + cos (240^(@)- theta )=

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  2. sin theta + sin (120^(@) + theta ) + sin ( theta - 120^(@))=

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  3. cos theta - cos (60^(@) + theta ) - cos(60^(@) - theta )=

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  4. cos 20^(@) + cos 100^(@) + cos 140^(@) =

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

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

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

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  10. If A=35^(@) , B= 15^(@) and C=40^(@) , then tan A* tan B+ tan B* tan...

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  12. If A+ B+C= pi//2 , " then " tan 2A + tan 2B+ tan 2C=

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  13. If A+B+C= pi//2 then show that cot A + cot B+ cot C=cot A cot B cot C

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  14. If A+B+C= pi//2 then show that cot A + cot B+ cot C=cot A cot B cot C

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