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| 1. |
Evaluate2tan2 45•+cos2 30•-sin2 60• |
| Answer» {tex}2{\\tan ^2}{45^ \\circ } + {\\cos ^2}{30^ \\circ } - {\\sin ^2}{60^ \\circ }{/tex}=\xa0{tex}2 \\times {\\left( 1 \\right)^2} + {\\left( {{{\\sqrt 3 } \\over 2}} \\right)^2} - {\\left( {{{\\sqrt 3 } \\over 2}} \\right)^2}{/tex}=\xa0{tex}2 + {3 \\over 4} - {3 \\over 4}{/tex}= 2 | |