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" Prove that "(cos20^(@)-sin20^(@))/(cos...

" Prove that "(cos20^(@)-sin20^(@))/(cos20^(@)+sin20^(@))=tan25^(@)

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Prove that (cos20^(@)-sin20^(@))/(cos20^(@)+sin20^(@))=tan 25^(@)

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(2cos40^(@)-cos20^(@))/(sin20^(@))

(2cos40^(@)-cos20^(@))/(sin20^(@))

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cos110^(@)+sin20=

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Prove that (sin70^(@)-cos40^(@))/(cos50^(@)-sin20^(@)) = 1/(sqrt(3)) .

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