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Prove that cos(60^(@)+A) + cos(60^(@)-...

Prove that
`cos(60^(@)+A) + cos(60^(@)-A)-cosA=0`

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Prove that cos 80^(@) cos40^(@)+cos40^(@) cos200^(@) +cos200^(@) cos 80^(@) = -3/4

Prove that cos 60^(@)=cos^(2)30^(@)-sin^(2)30^(@) .

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Prove that cos32^(@) sin20^(@) + cos144^(@) cos2^(@) + sin68^(@) cos56^(@) = 0

Prove that cos 10^(@) cos20^(@) + sin 45^(@) cos145^(@) + sin 55^(@) cos245^(@) = 0

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CHHAYA PUBLICATION-TRANSFORMATIONS OF SUMS AND PRODUCTS-Short Answer Type Questions
  1. Prove that sin 10^(@) + sin 50^(@)-sin70^(@)=0

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  2. Prove that cos 80^(@) - cos 40^(@) + sqrt3 cos 70^(@) = 0

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  3. Prove that cos(60^(@)+A) + cos(60^(@)-A)-cosA=0

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  4. Prove that "sin"((2pi)/3+theta)-"sin"((2pi)/3-theta) + sintheta=0

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  5. Prove that sin19^(@) + sin41^(@) + sin83^(@) = sin23^(@) + sin37^(@) ...

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  6. Prove that sin10^(@) + sin20^(@) + sin 40^(@) + sin 50^(@) = sin 70^(...

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  7. Prove that "cos" (3pi)/13 + "cos" (5pi)/13 - 2 "cos" (9pi)/13 "cos" (...

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  8. Prove that 4 sin 15^(@) sin 75^(@) = sqrt2 ( cos105^(@) + sin 75^(@)...

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  9. Prove that sin 80^(@) cos20^(@) + sin45^(@) cos145^(@)+sin 55^(@) co...

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  10. Prove that cos32^(@) sin20^(@) + cos144^(@) cos2^(@) + sin68^(@) cos...

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  11. Prove that cos306^(@) + cos234^(@) + cos162^(@) + cos18^(@) = 0

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  12. Prove that cos 10^(@) cos20^(@) + sin 45^(@) cos145^(@) + sin 55^(@)...

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  13. Prove that cos24^(@) + cos 55^(@) + cos125^(@) +cos204^(@) + cos300^...

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  14. Prove that cos20^(@) cos40^(@) cos80^(@) = 1/8

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  15. Prove that 8 sin20^(@) sin40^(@) sin80^(@) = sqrt3

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  16. Prove that tan20^(@) tan40^(@) tan80^(@) = sqrt3

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  17. Prove that cos40^(@) cos80^(@) cos160^(@) = -1/8

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  18. Prove that cos thetacos(60^(@)- theta)cos(60^(@)+theta) = 1/4 cos 3 ...

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  19. Prove that 4 sin theta sin(pi/3 + theta) sin (pi/3-theta) = sin 3 th...

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  20. Prove that cos alpha cos (120^(@) + alpha) cos (240^(@) + alpha) = 1...

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