Double Angle Formulae

• sin (A + B) = sinA.cosB + cosA.sinB

• sin 2A = sinA.cosA + cosA.sinA

• = 2sinA cosA

• cos (A + B) = cosA.cosB ñ sinA.sinB

• cos 2A = cosA.cosA ñ sinA.sinA

• = cos2A ñ sin2A

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