Double and half angle identities.notebook January 28, 2013 1 Double and half angle identities.notebook January 28, 2013 Section 7.4: Double and Half Angle Identities Verify: sin(θ + θ) = 2sinθcosθ cos(θ + θ) = cos2θ - sin2θ tan(θ+θ) 2 Double and half angle identities.notebook January 28, 2013 If sinθ = 3/4 and θ has it terminal side in the first quadrant, find the exact value of each function. a) sin2θ b)cos2θ c) tan 2θ d) what quadrant is 2θ in? e) sin 4θ 3 Double and half angle identities.notebook January 28, 2013 Use a halfangle identity to find the exact value of each function. cos(π/8) tan15 4

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