sin^2 60°+cos^2 60°-(根号2)cos45°

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sin^2 60°+cos^2 60°-(根号2)cos45°
sin^2 60°+cos^2 60°-(根号2)cos45°

sin^2 60°+cos^2 60°-(根号2)cos45°
sin^2 60°+ cos^2 60°-(√2)cos45°
= (√3/2)² + (1/2)² - √2×√2/2
= 3/4 + 1/4 - 1
= 0