C) Using Double Angle Formulas (plus earlier Trig) Identities to Memorize Save memorizing tangent identities by simply treating tangent as sine/cosine! Half Angle Formulas Double Angle Formulas Power Reducing Formulas (next assignment) +/- determined by quadrant for 8/2 (next assignment) sin 20-2 sin cos cos 26-cos²6-sin² tan 28 sin 26 cos26 tan 28- 2 tane 1-tan² @ - or -

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