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Prove that: (cos2A\ cos3A-cos2Acos7A+cos...

Prove that: `(cos2A\ cos3A-cos2Acos7A+cos10 A cos A)/(sin4A\ sin3A-sin2A sin5A+sin4Asin7A )=cot6A\ cot5A`

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RD SHARMA ENGLISH-TRANSFORMATION FORMULAE-All Questions
  1. Prove that: cosalpha+cosbeta+cosgamma+cos(alpha+beta+gamma)=4cos((alph...

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  2. Prove that: (cos4x+cos3x+cos2x)/(sin4x+sin3x+sin2x)=cot3x

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  3. Prove that: (cos2A\ cos3A-cos2Acos7A+cos10 A cos A)/(sin4A\ sin3A-sin2...

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  4. If three angles A, B, and C are in A.P. prove that: cot B=(sin A-sin C...

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  5. Prove that: (cos6theta+6cos4theta+15 cos2theta+10)/(cos5theta+5cos3the...

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  6. Express each of the following as the product of sines and cosines: sin...

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  7. Express each of the following as the product of sines or cosines: cos ...

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  8. Express each of the following as the product of sines and cosines: sin...

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  9. Express each of the following as the product of sines and cosines: sin...

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  10. Express each of the following as the product of sines and cosines: cos...

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  11. Prove that: sin38^0+sin 22^0=sin 82^0

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  12. Prove that: \ sin 50^0+sin 10^0=cos 20^0

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  13. Prove that: sin 105^@+cos 105^@=cos 45^@

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  14. Prove that: cos 100^0+cos 20^0=cos 40^0

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  15. Prove that: sin 23^0+sin 37^0=cos7^0

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  16. Prove that: sin 40^0+sin 20^0=cos 10^0

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  17. Prove that: cos 55^0+cos 65^0+cos 175^0=0

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  18. Prove that: cos 80^0+cos 40^0-cos 20^0=0

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  19. Prove that: sin 80^0-cos 70^0=cos 50^0

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  20. prove that :sin((5pi)/18)-cos((4pi)/9)=sqrt(3)sin(pi/9)

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