" If "cos20^(@)-sin20^(@)=p," then "cos4...

" If "cos20^(@)-sin20^(@)=p," then "cos40^(@)" is equal to: "

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" If "cos20^(@)-sin20^(@)=p," then "cos40^(@)" is equal to: "
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(cos20^(@)-sin20^(@))/(cos20^(@)+sin20^(@))=tan25^(@)
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If p=sin20^(@)-cos20^(@) then the value of cos40^(@) in terms of p is
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If cos20-sin20=p, then cos40 is equal to
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sin2 0^(@)*cos4 0^(@)+cos2 0^(@)*sin4 0^(@)=sqrt(3)/2
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prove that (cos20-sin20)/(cos20+sin20)=tan25
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(cos30^(@)-sin20^(@))/(cos40^(@)+cos20^(@))=(4)/(sqrt(3))cos40^(@)cos8...
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if sin2 A = 2sin A cosA and sin 20^@ = K, then the value of cos 20^@ c...
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Prove that : (cos 20^0 - sin 20^0)/(cos 20^0 + sin 20^0) = tan 25^0
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