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( sin(n+1) alpha - sin (n-1)alpha )/( co...

`( sin(n+1) alpha - sin (n-1)alpha )/( cos (n+1) alpha + 2 cos n alpha + cos (n-1) alpha )= `

A

`tan alpha `

B

`cot alpha `

C

`tan alpha //2`

D

`cot alpha //2`

Text Solution

Verified by Experts

The correct Answer is:
C
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DIPTI PUBLICATION ( AP EAMET)-TRIGONOMETRIC RATIOS AND IDENTITIES -EXERCISE 1 D ( TRANSFORMATIONS )
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  2. If none of A,B, A+B is an integral multiple of pi, then prove that (1-...

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  3. ( sin(n+1) alpha - sin (n-1)alpha )/( cos (n+1) alpha + 2 cos n alpha ...

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  4. ((cos theta - cos 3 theta ) ( sin 8 theta + sin 2 theta ))/(( sin 5 th...

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  5. ( sin 8 alpha * cos alpha - sin 6 alpha * cos 3 alpha )/(cos 2 alpha c...

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  6. ( sin alpha sin 3alpha + sin 3alpha sin 7 alpha + sin 5 alpha sin 15 ...

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  7. ( sin 4 A sin 3A - sin 5A sin 2A+ sin 7A sin 4A )/(cos 2A cos 3A - cos...

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  8. (sin 65^(@) + sin 25^(@))/( cos 65^(@) + cos 25^(@))=

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  9. ( sin 70^(@) + cos 40^(@) )/( cos 70^(@) + sin 40^(@))=

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  10. ( sin 75^(@) - sin 15^(@))/( cos 15^(@) - cos 75^(@))=

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  11. ( cos^(2) 33^(@) - cos^(2) 57^@)/( sin 21^(@) - cos 21^(@))=

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  12. (1+ cos 56^(@) + cos 58^(@) - cos 66^(@))/( cos 28^(@) cos 29^@ sin 3...

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  13. ( cos (45^(@) + A) - cos (45^(@) - A))/( sin (120^(@) + A)-sin(120^@-A...

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  14. A+C=2B implies ( cos C - cos A )/( sin A - sin C )=

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  15. x = cos 55^(@), y = cos 65^(@), z= cos 175^(@) " then " xy+yz+ zx=

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  16. cot (A+15^(@))- tan(A-15^(@))=

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  17. cot (15^(@) -A) + tan(15^(@) + A) =

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  18. If m* tan ( theta - 30^(@))= n* tan( theta + 120^(@)), "then " cos 2 ...

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  19. If sin alpha = sin beta and cos alpha = cos beta then

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  20. In DeltaABC, " if " cos A=( sin B)/( 2 sin C) , then the triangle is

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