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Without using trigonometric tables, prov...

Without using trigonometric tables, prove that :
`(i)tan 48^@tan 23^@tan 42^@tan 67^@ =1`
`(ii) tan 7^@tan 23^@ tan 60^@ 67^@tan 83^@=sqrt(3)`
`(iii)cot 12^@cot 38^@cot 52^@cot 60^@cot 78^@=(1)/(sqrt(3))`

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