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" (a) "4cos20^(@)-sqrt(3)cot20^(@)...

" (a) "4cos20^(@)-sqrt(3)cot20^(@)

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solve 4cos20^(@)-sqrt(3)cot20^(@)

Prove that (sin20^(@) + sin40^(@)) + (cos20^(@) + cos40^(@))=(sqrt(3)+1)cos10^(@)

Prove that (sin20^(@) + sin40^(@)) + (cos20^(@) + cos40^(@))=(sqrt(3)+1)cos10^(@)

(cos30^(@)-sin20^(@))/(cos40^(@)+cos20^(@))=(4)/(sqrt(3))cos40^(@)cos80^(@)

Prove that, (cos30^(@) - sin 20^(@))/(cos 40^(@) + cos20^(@)) = 4/sqrt3 cos40^(@) cos 80^(@)

Prove that: sqrt(3)"cosec"20^(@)-sec20^(@)=4

Prove that: sqrt(3)"cosec"20^(@)-sec20^(@)=4

Prove that: sqrt(3)"cosec"20^(@)-sec20^(@)=4

Prove that: sqrt(3)"cosec"20^(@)-sec20^(@)=4

Find the value of 3cos20^(@)-4cos^(3)20^(@) .