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If A +B+C= 2S , then prove that (i) si...

If `A +B+C= 2S `, then prove that
(i) `sin (S-A)+sin (S-B) + sin C=4 cos . (S-A)/(2) cos. (S-B)/(2) sin .(C)/(2)`
(ii) `cos (S-A)+cos (S-B)+cos C=-1+4 cos. (S-A)/(2) cos.(S-B)/(2)cos. (C)/(2)`

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