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cos 45° = 1/2√2
cos 0° = 1
Sin 60° + cos 45° - cos 0°
= 1/2√3 + 1/2√2 - 1
= √3/2 + √2/2 - 2/2
= (√3 + √2 - 2) / 2
Nb. Maaf kalau salah