Question

evaluate tan^2 30°+cos^2 19°+cos^2 71°.

Answer 1

${(tan \: 30)}^{2} + {cos(90 - 71)}^{2} + {cos \: 71 }^{2} \\ ( \frac{1}{ \sqrt{3} } ) whole \: sq+ {sin71 }^{2} + {cos \: 71}^{2} \\ = \frac{1}{3} + 1 \\ = \frac{4}{3}$
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