Vraag # 9e7a0

Vraag # 9e7a0
Anonim

Antwoord:

# X = 0,1.77,4.51,2pi #

Uitleg:

Eerst zullen we de identiteit gebruiken # Tan ^ 2x = s ^ 2x-1 #

# ^ Sec 2x-1 + 4secx = 4 #

# Sec ^ 2x + 4secx-5 = 0 #

# A = secx #

# A ^ 2 + 4a-5 = 0 #

# (A-1) (a + 5) = 0 #

# a = 1 of a = -5 #

# secx = 1 of secx = -5 #

# cosx = 1 of -1 / 5 #

# x = arccos (1) = 0 en 2pi #

of

# x = arccos (-1/5) ~~ 1.77 ^ c of ~ 4.51 ^ c #