cos(x+7x)=0

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


Simplifying
cos(x + 7x) = 0

Combine like terms: x + 7x = 8x
cos(8x) = 0

Remove parenthesis around (8x)
cos * 8x = 0

Reorder the terms for easier multiplication:
8cos * x = 0

Multiply cos * x
8cosx = 0

Solving
8cosx = 0

Solving for variable 'c'.

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

Divide each side by '8'.
cosx = 0

Simplifying
cosx = 0

The solution to this equation could not be determined.

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