Prove: cos4x = 8cos^ 4x - 8cos^2 x + 1 - Trigonometry - How to prove this equation in step-by-step

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#Trigonometry
#Technique
#Formula
  1. Calculus Physics Chem Accounting Tam Mai Thanh Cao
  2. Trig
  3. Trigonometry
  4. Trigonometric
  5. Function
  6. trigonometric techniques of integration
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