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सिद्ध कीजिए कि - tan15^(@)+tan30^(@)+...

सिद्ध कीजिए कि -
`tan15^(@)+tan30^(@)+tan15^(@) tan 30^(@)=1`

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tan15^(@) + tan 75^(@)=

tan 75 ^(@) - tan 30^(@)- tan 75^(@) tan 30^(@) =1.

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tan 75^(@) - tan 30^@ - tan 75^(@) * tan 30^*(@) =

(tan60^(@)-tan30^(@))/(1+tan60^(@)tan30^(@))=tan30

(2 tan 30^(@))/( 1-tan ^(2) 30^(@)) =

(2 tan 30^(@))/( 1-tan ^(2) 30^(@)) =