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4sec² 30°+2tan 45°-3tan²60°
4(1/cos(30))²-2tan(45)-3tan²(60)
4(1/cos(30))²=4/cos²(30)
4/cos²(30) +2tan(45)-3tan²(60)
4/(√3/2)²+2.1-3(√3)²
2².4/3 +2-9
16/3-7
16-21/3
-5/3
Rpta: -5/3
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