cos(x+y)+cos(x-y)=

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Solution for cos(x+y)+cos(x-y)= equation:


Simplifying
cos(x + y) + cos(x + -1y) = 0
(x * cos + y * cos) + cos(x + -1y) = 0
(cosx + cosy) + cos(x + -1y) = 0
cosx + cosy + (x * cos + -1y * cos) = 0
cosx + cosy + (cosx + -1cosy) = 0

Reorder the terms:
cosx + cosx + cosy + -1cosy = 0

Combine like terms: cosx + cosx = 2cosx
2cosx + cosy + -1cosy = 0

Combine like terms: cosy + -1cosy = 0
2cosx + 0 = 0
2cosx = 0

Solving
2cosx = 0

Solving for variable 'c'.

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

Divide each side by '2'.
cosx = 0

Simplifying
cosx = 0

The solution to this equation could not be determined.

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