Express cos 2A in terms of sin A.

Discussion

Ask about a step, share a shortcut, or explain it your way. Be kind; no links.

No comments yet. Be the first to explain it.

More Trigonometry questions

• Without using tables, find the value of sin 75°.
• Without tables, find tan 15°.
• The value of tan 45° is
• Solve 2 cos θ − 1 = 0 for 0° ≤ θ ≤ 360°.
• If sin θ = 3/5 and θ is acute, then cos θ is