Jak si ověřujete (tan ^ 2x) / (secx-1) -1 = secx?

Jak si ověřujete (tan ^ 2x) / (secx-1) -1 = secx?
Anonim

# "Levá strana" = tan ^ 2x / (secx-1) -1 #

Použít identitu: # cos ^ 2x + sin ^ 2x = 1 #

# => 1 + tan ^ 2x = sec ^ 2x #

# => tan ^ 2x = sec ^ 2x-1 #

# => "Levá strana" = (sec ^ 2x-1) / (secx-1) -1 = (zrušit ((secx-1)) (secx + 1) / zrušit (secx-1) -1 #

# => secx + 1-1 = barva (modrá) secx = "Pravá strana" #