cos(2x)+3cos(x)-4=0

Simple and best practice solution for cos(2x)+3cos(x)-4=0 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)+3cos(x)-4=0 equation:


Simplifying
cos(2x) + 3cos(x) + -4 = 0

Remove parenthesis around (2x)
cos * 2x + 3cos(x) + -4 = 0

Reorder the terms for easier multiplication:
2cos * x + 3cos(x) + -4 = 0

Multiply cos * x
2cosx + 3cos(x) + -4 = 0

Multiply cos * x
2cosx + 3cosx + -4 = 0

Reorder the terms:
-4 + 2cosx + 3cosx = 0

Combine like terms: 2cosx + 3cosx = 5cosx
-4 + 5cosx = 0

Solving
-4 + 5cosx = 0

Solving for variable 'c'.

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

Add '4' to each side of the equation.
-4 + 4 + 5cosx = 0 + 4

Combine like terms: -4 + 4 = 0
0 + 5cosx = 0 + 4
5cosx = 0 + 4

Combine like terms: 0 + 4 = 4
5cosx = 4

Divide each side by '5osx'.
c = 0.8o-1s-1x-1

Simplifying
c = 0.8o-1s-1x-1

See similar equations:

| (1,3),m=-3/4 | | -2ysquared+3ysquared= | | x+9=y-5 | | 3x^2-x-102=0 | | -6=2(p-3)+4(p+6) | | 5/6x-1/2=3/4x | | 851/0.9 | | -1-(8y-2)=5(2y-7) | | 7.34-y=9.06 | | K/6.2=1.5 | | 81=t+5 | | (4x-8)(7x+6)=0 | | -2x+6=-5x-4 | | 4x+2(3x-1)=-52 | | 6p-7q=18 | | 98=n+42 | | 48=2 | | 6/-3=-7 | | 7(3x+1)=5x-9x | | Y+3=-10 | | 4+w=32 | | (-5x^3+4x^5+6)= | | -9+9y+4-6y= | | 7x*[x-1.8]=0 | | 9=1/2x-y | | 0=4(n-4)-6(n-4) | | 2x^2-10x+3y+8=0 | | ((1/x)-1)/(1-(1/x-6))≥0 | | x^(5/2)-x^(3/2) | | 8(x+7)=-6x | | (4x-5)(5x+4)=0 | | 13=4q+1 |

Equations solver categories