Exact trig values

• sin 0° = 0
• sin 30° = 1/2
• sin 45° = root 2/2
• sin 60° = root 3/2
• sin 90° = 1
• cos 0° = 1
• cos 30° = root 3/2
• cos 45° = root 2/2
• cos 60° = 1/2
• cos 90° = 0
• tan 0° = 0
• tan 30° = root 3/3
• tan 45° = 1
• tan 60° = root 3
• tan 90° = undefined