2 . (tan 45°)² + cos 30° - (sin 60°)²
= 2 . 1² + 1/2 √3 - (1/2 √3)²
= 2 + 1/2 √3 - 3/4
= 4/4 + 2/4 √3 - 3/4
= (1 + 2 √3)/4
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2 . (tan 45°)² + cos 30° - (sin 60°)²
= 2 . 1² + 1/2 √3 - (1/2 √3)²
= 2 + 1/2 √3 - 3/4
= 4/4 + 2/4 √3 - 3/4
= (1 + 2 √3)/4