Without using trigonometric tables, prove that :   `(i)tan 48^@tan 23^@tan 42^@tan 67^@ =1`
Channel: Doubtnut
Date: 2020-04-12

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))`