cos(2x+20)=-cos(x-11)

Simple and best practice solution for cos(2x+20)=-cos(x-11) equation. Check how easy it is, and learn it for the future. Our solution is simple, and easy to understand, so don`t hesitate to use it as a solution of your homework.

If it's not what You are looking for type in the equation solver your own equation and let us solve it.

Solution for cos(2x+20)=-cos(x-11) equation:


Simplifying
cos(2x + 20) = -1cos(x + -11)

Reorder the terms:
cos(20 + 2x) = -1cos(x + -11)
(20 * cos + 2x * cos) = -1cos(x + -11)
(20cos + 2cosx) = -1cos(x + -11)

Reorder the terms:
20cos + 2cosx = -1cos(-11 + x)
20cos + 2cosx = (-11 * -1cos + x * -1cos)
20cos + 2cosx = (11cos + -1cosx)

Solving
20cos + 2cosx = 11cos + -1cosx

Solving for variable 'c'.

Move all terms containing c to the left, all other terms to the right.

Add '-11cos' to each side of the equation.
20cos + -11cos + 2cosx = 11cos + -11cos + -1cosx

Combine like terms: 20cos + -11cos = 9cos
9cos + 2cosx = 11cos + -11cos + -1cosx

Combine like terms: 11cos + -11cos = 0
9cos + 2cosx = 0 + -1cosx
9cos + 2cosx = -1cosx

Add 'cosx' to each side of the equation.
9cos + 2cosx + cosx = -1cosx + cosx

Combine like terms: 2cosx + cosx = 3cosx
9cos + 3cosx = -1cosx + cosx

Combine like terms: -1cosx + cosx = 0
9cos + 3cosx = 0

Factor out the Greatest Common Factor (GCF), '3cos'.
3cos(3 + x) = 0

Ignore the factor 3.

Subproblem 1

Set the factor 'cos' equal to zero and attempt to solve: Simplifying cos = 0 Solving cos = 0 Move all terms containing c to the left, all other terms to the right. Simplifying cos = 0 The solution to this equation could not be determined. This subproblem is being ignored because a solution could not be determined.

Subproblem 2

Set the factor '(3 + x)' equal to zero and attempt to solve: Simplifying 3 + x = 0 Solving 3 + x = 0 Move all terms containing c to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = 0 + -3 Combine like terms: 3 + -3 = 0 0 + x = 0 + -3 x = 0 + -3 Combine like terms: 0 + -3 = -3 x = -3 Add '-1x' to each side of the equation. x + -1x = -3 + -1x Combine like terms: x + -1x = 0 0 = -3 + -1x Simplifying 0 = -3 + -1x The solution to this equation could not be determined. This subproblem is being ignored because a solution could not be determined. The solution to this equation could not be determined.

See similar equations:

| -.84=(x-80)/12 | | m-7m+9m-4= | | 6m+17=9m-4 | | -.84=x-80/12 | | X^3/2-58x^1/2=0 | | 3x+-3x-17=-17 | | 7x+5=12x+(-10) | | y+0.52=-0.24 | | (7x-2)(x-3)=0 | | -2(4t-5)+6t=8t-9 | | 0.7t=0.2+0.3t | | -2(7y-5)=14y-23 | | 2x-(7-8x)-7x=-5x+9 | | 3(-2-2)= | | 60x-360=0 | | 5c/3ab | | 6t+7=-5 | | -3y-11=2y+19 | | -2p+5+3p=11 | | 7x+7-8x+4=6x-7x-5 | | -2p+5+3p=15 | | 8u-6=6(u-4) | | 6=5+d | | 6=5d | | 2x-(7-8x)-7x=5x+9 | | 12x+(-6)=8x+14 | | 40=-2(23-b)+3(b-3) | | 2x-(7)8x-7x=5x+9 | | (x+3)=x+5 | | 132x-312=0 | | 5t-26=26 | | .3+5y=3x |

Equations solver categories