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Prove that (i) " sin " 75^(@) =((sqr...

Prove that
` (i) " sin " 75^(@) =((sqrt(6)+sqrt(2)))/(4)``(ii) (cos 135^(@) -cos 120^(@))/(cos 135^(@) +cos 120^(@)) =(3 -2sqrt(2))`
`(iii) " tan " 15^(@) +" cot " 15^(@) =4`

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