" (iii) "(cos20^(@)-sin20^(@))/(cos20^(@...

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

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

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

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

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

Prove that, (cos 20^(@) + sin 20^(@))/(cos 20^(@) - sin 20^(@)) = tan 65^(@)

sec70^(@)sin20^(@)+cos20^(@)cosec70^(@)=2

cos110^(@)+sin20=

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

tan20^(@)+4sin20^(@)

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