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[" (b) "(2cos40^(@)-cos20^(@))/(sin20^(@...

[" (b) "(2cos40^(@)-cos20^(@))/(sin20^(@))],[" (d) "tan10^(@)-tan50^(@)+tan70^(@)]

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The value of tan10^(@)tan50^(@)tan70^(@) is

tan70^@-tan20^@-2tan40^@=

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

tan 70^(@) - tan 20^(@) -2 tan 40^(@)=

tan 70^(@) - tan 20^(@) -2 tan 40^(@)=

Prove that tan70^(@)=2tan50^(@)+tan20^(@)

Prove that tan70^(@)-tan20^(@)=2tan50^(@) .