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| 1. |
Find the value of cos (-1710) |
| Answer» cos (-1710o)= cos (1710o) (As cos (-x) = cos x){tex}=\\cos(1710\\times{\\textstyle\\frac{\\mathrm\\pi}{180}}){/tex}{tex}=\\cos({\\textstyle\\frac{19\\mathrm\\pi}2}){/tex}{tex}=\\cos(9{\\textstyle\\frac12}\\mathrm\\pi){/tex}{tex}=\\cos(10\\mathrm\\pi{\\textstyle\\frac{\\mathrm\\pi}2}){/tex}{tex}=\\cos(-{\\textstyle\\frac{\\mathrm\\pi}2}){/tex}{tex}=\\cos(-{\\textstyle\\frac{180}2}){/tex}= cos (-90o)= cos 90 (As cos (-x) = cos x )= 0\xa0 | |