nilai cos 30 derajat + sin 120 derajat - cos315 derajat

cos 30 = 1/2√(3)
sin 120 = sin (180 - 60)
= sin 60 = 1/2√(3)
cos 315 = cos (360 - 45)
= cos 45 = 1/2√(2

1/2√(3) + 1/2√(3) - 1/2√(2)
=√(3) - 1/2 √(2)

cos 30 = 1/2√3
sin 120 = 1/2√3
cos 315 = 1/2√2

cos 30 + sin 120 - cos 315
= 1/2√3 + 1/2√3 -1/2√2
=√3-1/2√2