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-117475497205Double Angle Formulas: sin2x=2sinxcosxcos2x=cos2x-sin2xtan2x=2tanx1-tan2x=2cos2x-1=1-2sin2x00Double Angle Formulas: sin2x=2sinxcosxcos2x=cos2x-sin2xtan2x=2tanx1-tan2x=2cos2x-1=1-2sin2x 5.5 Double Angle Formulas5.5 Double Angle FormulasDouble Angle Examples:If sin x= 34 in Quadrant I, find each of the double angle values. sin 2x=b) cos 2x=c) tan 2x=-396816144504What did we just find????66411108585If cos x= -2425 , π≤x≤3π2, find each of the double angle values. sin 2x=b) cos 2x=c) tan 2x=Verifying Identities with Double Angle FormulasEXAMPLES: 3) cos4x-sin4x=cos2x4) sin2x=-2sinxsinx-π2 ................
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