3 cos 3600° + sin(-1560°) + cos(-450°)
= 3 cos (3600° - 360°) + sin(1560°) + cos(450°)
= 3 cos 3240° + sin 1560° + cos 450°
= 3 cos (9 360°) + sin (4 360° + 360°) + cos (360° - 270°)
= 3 cos (9 360°) + sin (4 360° + 360°) + cos (90°)
= 3 cos 360° + sin 360° + cos 90°
= 3 + 0 + 0
= 3
Therefore, 3 cos 3600° + sin(-1560°) + cos(-450°) = 3.
3 cos 3600° + sin(-1560°) + cos(-450°)
= 3 cos (3600° - 360°) + sin(1560°) + cos(450°)
= 3 cos 3240° + sin 1560° + cos 450°
= 3 cos (9 360°) + sin (4 360° + 360°) + cos (360° - 270°)
= 3 cos (9 360°) + sin (4 360° + 360°) + cos (90°)
= 3 cos 360° + sin 360° + cos 90°
= 3 + 0 + 0
= 3
Therefore, 3 cos 3600° + sin(-1560°) + cos(-450°) = 3.