Double and half angle identities.notebook February 02, 2012 1 Double and half angle identities.notebook February 02, 2012 2 Double and half angle identities.notebook February 02, 2012 3 Double and half angle identities.notebook February 02, 2012 Verify: sin(θ + θ) = 2sinθcosθ cos(θ + θ) = cos2θ - sin2θ 4 Double and half angle identities.notebook February 02, 2012 Section 7.4: Double and Half Angle Identities 5 Double and half angle identities.notebook February 02, 2012 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) what quadrant is 2θ in? 6 Double and half angle identities.notebook February 02, 2012 Verify: csc2x = 1/2(secx cscx) 7
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