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Use Addition Formulae to get the Double Angle Formulae

Explore the double angle formulae, addition formulae, simplification techniques, and proof methods in mathematics. Solve equations, simplify expressions, and learn concepts like sin2θ = cosθ.

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Use Addition Formulae to get the Double Angle Formulae

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  1. Use Addition Formulae to get the Double Angle Formulae sin (A + B) = sinAcosB + cosAsinB sin 2A = cos (A + B) = cosAcosB - sinAsinB cos 2A =

  2. tan (A + B) = tan 2A =

  3. Double Angle Formulae sin2A = 2sinAcosA cos2A = cos2A – sin2A = 1 – 2sin2A = 2cos2A – 1 tan2A =

  4. Express more simply; a) cos275 – sin275 b) sec2θcosec2θ

  5. 2. Solve sin2θ = cosθ for 0 ≤ θ≤ 2π

  6. 3. Simplify 4. Prove

  7. From C3 June 2016

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