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सिद्ध कीजिए कि (i) tan48^(@)tan23^(@)tan...

सिद्ध कीजिए कि `(i) tan48^(@)tan23^(@)tan42^(@)tan67^(@)=1`
(ii)` cos38^(@)cos52^(@)-sin38^(@)sin52^(@)=0.`

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Show that : (i) tan\ 48^@ tan 23^@\ tan 42^@tan 67^@=1 (ii) cos 38^@\ cos 52^@ - sin 38^@ sin 52^@=0