Question

What is the sine and cosine of 240

Answer 1

Sin(240) = -√(3)/2
sin(240) = 2sin(120)cos(120)
sin(240) = 2[2sin(60)cos(60)cos(120)]
sin(240) = 2[2[2sin(30)cos(30)cos(60)cos(120)]]
sin(240) = 2[2[2[2sin(15)cos(15)cos(30)cos(60)cos(120)]]]
sin(240) = 16sin(15)cos(15)cos(30)cos(60)cos(120)

cos(240) = ⁻¹/₂
cos(240) = cos¹⁶(15) - sin¹⁶(15)

Answer 2

Sine:
0.94544515492
Cosine:
0.32578130553