USofhj USofhj
  • 02-04-2020
  • Mathematics
contestada

someone help me please.

someone help me please class=

Respuesta :

MathPhys
MathPhys MathPhys
  • 02-04-2020

Step-by-step explanation:

½ tan² x − 2 cos² x = 1

tan² x − 4 cos² x = 2

sin² x − 4 cos⁴ x = 2 cos² x

1 − cos² x − 4 cos⁴ x = 2 cos² x

0 = 4 cos⁴ x + 3 cos² x − 1

0 = (cos² x + 1) (4 cos² x − 1)

0 = 4 cos² x − 1

4 cos² x = 1

cos² x = ¼

cos x = ±½

x = π/3, 2π/3, 4π/3, 5π/3

Answer Link

Otras preguntas

-5x+y=-10 and -4x-y=-26
6 h ​ −1=−3 what is the answer
55:26 Square ABCD was translated using the rule (x, y) → (x – 4, y + 15) to form A'B'C'D'. What are the coordinates of point D in the pre-image if the coordinat
Math homework pls helps!!
a parabola has focus of (5 2) and directrix y=0.where is the parabola's vertex
A triangle has an area of 48 square centimeters. The height of the triangle is 6 centimeters. What is the base of the triangle?
Ways in which a teacher plays a role in the literacy development of the learners​
Which of the following is NOT a common way businesses pay employees?
The story of Mary Shelley
HOTS: What is the Middle Way? How would you have applied the Middle Way in your life as a middle school student? BTW This is for anicent india - Buddhism !