[" 66."cos80^(@)+cos40^(@)-cos20^(@)],["...

[" 66."cos80^(@)+cos40^(@)-cos20^(@)],[" किसके बराबर है ? "]

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cos 20^(@) cos 40^(@) cos 80^(@)=

cos20 ^ (@) cos40 ^ (@) cos80 ^ (@) =

cos80 ^ (0) + cos40 ^ (@) - cos20 ^ (@) = 0

cos20^@cos40^@cos80^@=

cos20^(@)cos40^(@)cos60^(@)cos80^(@)=

Prove that cos80^(@)+cos40^(@)-cos20^(@)=0 .

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

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

Prove that, cos80^(@)+cos40^(@)-cos20^(@)=0

Prove that: cos80^(@)+cos40^(@)-cos20^(@)=0

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