3=5(cos(3.94x))

Solution for 3=5(cos(3.94x)) equation:

Simplifying
3 = 5(cos(3.94x))

Remove parenthesis around (3.94x)
3 = 5(cos * 3.94x)

Reorder the terms for easier multiplication:
3 = 5(3.94cos * x)

Multiply cos * x
3 = 5(3.94cosx)

Remove parenthesis around (3.94cosx)
3 = 5 * 3.94cosx

Multiply 5 * 3.94
3 = 19.7cosx

Solving
3 = 19.7cosx

Solving for variable 'c'.

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

Add '-19.7cosx' to each side of the equation.
3 + -19.7cosx = 19.7cosx + -19.7cosx

Combine like terms: 19.7cosx + -19.7cosx = 0.0
3 + -19.7cosx = 0.0

Add '-3' to each side of the equation.
3 + -3 + -19.7cosx = 0.0 + -3

Combine like terms: 3 + -3 = 0
0 + -19.7cosx = 0.0 + -3
-19.7cosx = 0.0 + -3

Combine like terms: 0.0 + -3 = -3
-19.7cosx = -3

Divide each side by '-19.7osx'.
c = 0.152284264o-1s-1x-1

Simplifying
c = 0.152284264o-1s-1x-1