Cos(x)+sin(x)=корень2

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This is not a valid mathematical equation.

The equation you have written is:
cos(x) + sin(x) = √2

This equation cannot be solved algebraically because it involves two different trigonometric functions (cosine and sine) being added together. These functions cannot be simply combined or simplified into a single value.

You can, however, graph both sides of the equation to find the values of x where the equation holds true. The graph will show where the cosine and sine functions intersect at the square root of 2.