HONORS PRE-CALC Name: Date: 5.5 Double Half Angle FormulaS Double Angle ...

sin2x = 2sinxcosx cos2x = cos2x — sin2x = 2cos2x — 1 = 1 — 2sin2x 2 tanx tan2x = 1—tan2x 3 3171 Double Angle Examples: +8 1) If sin - in Quadrant l, find each of the double angle values. b) cos 2x= COS c) tan 2x= -n --21 Sin c) tan 2x= sin COS 33(0 a) sin 2x= 31ñ ................
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