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Evaluate 2tan2 45•+cos2 30•-sin2 60•

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Posted by Amrit Raj 7 years, 11 months ago

Rashmi Bajpayee 7 years, 11 months ago

$2{\tan ^2}{45^ \circ } + {\cos ^2}{30^ \circ } - {\sin ^2}{60^ \circ }$

= $2 \times {\left( 1 \right)^2} + {\left( {{{\sqrt 3 } \over 2}} \right)^2} - {\left( {{{\sqrt 3 } \over 2}} \right)^2}$

= $2 + {3 \over 4} - {3 \over 4}$

= 2

ANSWER

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