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1 - 2sen²x = 2cos²x - 1 (Por identidad fundamental sen²x = 1 - cos²x
reemplazas)
1 - 2(1 - cos²x) = 2cos²x - 1
1 - 2 + 2cos²x = 2cos²x - 1
- 1 + 2cos²x = 2cos²x - 1
2cos²x - 1 = 2cos²x - 1