evaluate : 2tan^2 45° +cos^2 30° - sin^2 60°
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tan45°=1
cos 30°=√3/2
sin 60° =√3/2
2 tan²45+cos²30-60
=2(tan45)²+(cos30)²-(sin60)²
=2(1)+(√3/2)-(√3/2)²
=2(1)=2
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