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Prove that:costhetacos(theta/2)-cos3thet...

Prove that:`costhetacos(theta/2)-cos3thetacos((9theta)/2)=sin((7theta)/2)\ sin4thetadot`

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  3. Prove that:costhetacos(theta/2)-cos3thetacos((9theta)/2)=sin((7theta)/...

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  4. Prove that: (sin A+sin3A)/(cos A-cos3A)=cotA

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  6. Prove that: (sin A-sin B)/(cos A+cos B)=tan((A-B)/2)

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  7. Prove that: (sin A+sin B)/(sin A-sin B)=tan((A+B)/2)cot((A-B)/2)

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  8. Prove that: (cos A+cos B)/(cos B-cos A)=cot((A+B)/2)cot((A-B)/2)

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  9. Prove that:(sinA+sin3A+sin5A)/(cos A+cos3A+cos5A)=tan3A

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  10. Prove that: (cos3A+2cos5A+cos7A)/(cos A+2cos3A+cos5A)=(cos5A)/(cos3A)

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  11. Prove that: (cos4A+cos3A+cos2A)/(sin4A+sin3A+sin2A)=cot3A

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  12. Prove that: (sin3A+sin5A +sin7A+sin9A)/(cos3A+cos5A+cos7A+cos9A)=tan6A

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  15. Prove that: (sin11 A\ sin A+sin7A\ sin3A)/(cos 11\ A\ sin A+cos7Asin3A...

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  17. prove that : (sinA+2sin3A+sin5A)/(sin3A+2sin5A+sin7A)=(sin3A)/(sin5A)

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