2(tan 45 derajat) ² + (cos 30 derajat) - (sin 60 derajat) ²

2(tan45)² + cos30 - (sin60)²
=2(1)² + 1/2✓3 - (1/2✓3)²
= 2 + 1/2✓3 - 3/4
= (8 + 2✓3 - 3) / 4
= [(5+2✓3) / 4 ]