4/5 tan2*60º + 3 sin2*60º
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4/5 tan2*60º + 3 sin2*60º
=4/5×(root over3) ^2+3×(root over3/2)^2
=12/5+9/4
=12×4+9×5/20
=93/20
=4/5×(root over3) ^2+3×(root over3/2)^2
=12/5+9/4
=12×4+9×5/20
=93/20
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