(cos(x))2+8cos(x)+7=0

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Solution for (cos(x))2+8cos(x)+7=0 equation:


Simplifying
(cos(x)) * 2 + 8cos(x) + 7 = 0

Multiply cos * x
(cosx) * 2 + 8cos(x) + 7 = 0

Reorder the terms for easier multiplication:
2cosx + 8cos(x) + 7 = 0

Multiply cos * x
2cosx + 8cosx + 7 = 0

Reorder the terms:
7 + 2cosx + 8cosx = 0

Combine like terms: 2cosx + 8cosx = 10cosx
7 + 10cosx = 0

Solving
7 + 10cosx = 0

Solving for variable 'c'.

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

Add '-7' to each side of the equation.
7 + -7 + 10cosx = 0 + -7

Combine like terms: 7 + -7 = 0
0 + 10cosx = 0 + -7
10cosx = 0 + -7

Combine like terms: 0 + -7 = -7
10cosx = -7

Divide each side by '10osx'.
c = -0.7o-1s-1x-1

Simplifying
c = -0.7o-1s-1x-1

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