October 2018 1 17 Report
AYUDA!!
Verificar mas sihuientes identidades trigonometricas: (con proceso por favor)

1). 1 / 1 + tan^2A = cos^2A
2). 2cos^2 A - 1 = 1-2 sen^2 A
3). Tan^2 A / 1 + tan^2 A = sen^2 A
4). Sec^2 A + tan^2 A = 2 tan^2 A + 1

Gracias. Lo necesito urgente...

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