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Without using trigonometric tables , pro...

Without using trigonometric tables , prove that :
(i) `sin50^(@)-cos40^(@)=0`
(ii) `tan36^(@)-cot54^(@)=0`
(iii) `sec25^(@)-"cosec "65^(@)=0`
(iv) `sin^(2)32^(@)+sin^(2)58^(@)=1`
(v) `"cosec"^(2)39^(@)tan^(2)51^(@)=1`
(vi) `sec^(2)10^(@)-cot^(2)80^(@)=1`

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