cos(2x)+5cosx+3=0

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Solution for cos(2x)+5cosx+3=0 equation:


Simplifying
cos(2x) + 5cosx + 3 = 0

Remove parenthesis around (2x)
cos * 2x + 5cosx + 3 = 0

Reorder the terms for easier multiplication:
2cos * x + 5cosx + 3 = 0

Multiply cos * x
2cosx + 5cosx + 3 = 0

Reorder the terms:
3 + 2cosx + 5cosx = 0

Combine like terms: 2cosx + 5cosx = 7cosx
3 + 7cosx = 0

Solving
3 + 7cosx = 0

Solving for variable 'c'.

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

Add '-3' to each side of the equation.
3 + -3 + 7cosx = 0 + -3

Combine like terms: 3 + -3 = 0
0 + 7cosx = 0 + -3
7cosx = 0 + -3

Combine like terms: 0 + -3 = -3
7cosx = -3

Divide each side by '7osx'.
c = -0.4285714286o-1s-1x-1

Simplifying
c = -0.4285714286o-1s-1x-1

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