nilai cos 150 derat + sin 45 derajat + cotg (-330 derajat)

cos (90+60) + sin 45 + cotg (-360 + 30)
= -sin 60 + sin 45 + cotg 30
= -1/2 akar 3 + 1/2 akar 2 + akar 3
= (akar 3 + akar 2)/2

Bab Trigonometri
Matematika SMA Kelas X

cos 150° + sin 45° + cot (-330)°
= -1/2 √3 + 1/2 √2 - (-√3)
= -1/2√3 + 1/2 √2 + √3
= 1/2√3 + 1/2 √2
= 1/2 (√3 + √2)