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Prove that: (cos4x+cos3x+cos2x)/(sin4x+s...

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

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  2. Prove that: cosalpha+cosbeta+cosgamma+cos(alpha+beta+gamma)=4cos((alph...

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

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

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

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

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

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

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

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