To solve the trigonometric equation cos4x + cos8x + cos12x = 0, we can make use of the sum-to-product trigonometric identities.
Using the identity cos(A) + cos(B) = 2cos((A + B)/2)cos((A - B)/2), we can rewrite the equation as:
2cos(6x)cos(-2x) + cos(6x) = 0
Simplifying this further, we get:
cos(6x)(2cos(-2x) + 1) = cos(6x)(2cos(2x) + 1) = 0
The solutions can be found by setting each factor to zero:
1) cos(6x) = 6x = π/2 + nπ, where n is an integex = π/12 + (n/6)π
2) 2cos(2x) + 1 = cos(2x) = -1/2x = 2π/3 + 2nπ or 2x = 4π/3 + 2nπ
x = π/3 + nπ or x = 2π/3 + nπ
Therefore, the solutions to the equation cos4x + cos8x + cos12x = 0 are:
x = π/12 + (n/6)π, π/3 + nπ, 2π/3 + nwhere n is an integer.
To solve the trigonometric equation cos4x + cos8x + cos12x = 0, we can make use of the sum-to-product trigonometric identities.
Using the identity cos(A) + cos(B) = 2cos((A + B)/2)cos((A - B)/2), we can rewrite the equation as:
2cos(6x)cos(-2x) + cos(6x) = 0
Simplifying this further, we get:
cos(6x)(2cos(-2x) + 1) =
cos(6x)(2cos(2x) + 1) = 0
The solutions can be found by setting each factor to zero:
1) cos(6x) =
6x = π/2 + nπ, where n is an intege
x = π/12 + (n/6)π
2) 2cos(2x) + 1 =
cos(2x) = -1/
2x = 2π/3 + 2nπ or 2x = 4π/3 + 2nπ
x = π/3 + nπ or x = 2π/3 + nπ
Therefore, the solutions to the equation cos4x + cos8x + cos12x = 0 are:
x = π/12 + (n/6)π, π/3 + nπ, 2π/3 + n
where n is an integer.