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What is the double-angle identity for sin(2θ)?

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2 sin(θ) cos(θ)

This identity is derived from the sum identity sin(A + B) = sinA cosB + cosA sinB by setting A and B equal to θ. It is frequently used to simplify integrals and solve equations.

Also asked as:
  • In trigonometry, what is the expression for sin(2θ) in terms of sin(θ) and cos(θ)?

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