सिद्ध कीजिए कि (i) ((sin 35^(@))/(cos 5...

सिद्ध कीजिए कि
(i) `((sin 35^(@))/(cos 55^(@)))+((cos 55^(@))/(sin 35^(@)))-2cos60^(@)=1`
(ii) `((sin47^(@))/(cos 43^(@)))+((cos 43^(@))/(sin 47^(@)))=4cos ^(2)45^(@)`
(iii) `(sin ^(2)63^(@)+sin ^(2)27^(@))/(sec ^(2)20^(@)-cot^(2)70^(@))+2sin 36^(@)sin 42^(@). sec 48^(@)sec 54^(@)=3`

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