nilai dari cos² 45° + sin² 45° + cos 120°
Matematika
hanifa131
Pertanyaan
nilai dari cos² 45° + sin² 45° + cos 120°
1 Jawaban
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1. Jawaban Anisazhf
cos^2 45 derajat + sin^2 45 derajat + cos 120 derajat
= (cos 45)^2 + (sin 45)^2 + (-cos 180 - 60)
= (1/2 × 2^(1/2))^2 + (1/2 × 2^(1/2))^2 - (cos 60)
= (1/4 × 2) + (1/4 × 2) - 1/2
= 1/2 + 1/2 - 1/2
= 1/2