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Why it has not solution phối "$x=frac7pi 4+pi n$"? Although it satisfy the equation.

Please help quickly.

The equation is equivalent to$$ an x=-1$$ since the two functions $cos$ và $sin$ don"t vanish together so we find$$xequivfrac3pi4mod pi$$

A solution mix is a phối of points that satisfies a given equation. A given equation will have only one solution set. That set can have many descriptions. $frac 3pi4+npi$ is one mô tả tìm kiếm of the solution mix for this equation. $frac 7pi4+mpi$ is another description of the same set.

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Note that$$frac7pi4 + npi = left(1 + frac34 ight)pi + npi = frac3pi4 + (n+1)pi,$$so you are naming the same mix of solutions but with a different indexing system.

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