Find All Solutions to the Equation $\cos x = \sin x$

Find all solutions to the equation.
- $\cos x = \sin x$

A) $\left\{ \frac { \pi } { 4 } + 2 \mathrm { n } \pi , \frac { 7 \pi } { 4 } + 2 \mathrm { n } \pi \mid \mathrm { n } = 0 , \pm 1 , \pm 2 , \ldots \right\}$
B) $\left\{ \frac { \pi } { 4 } + n \pi \mid \mathrm { n } = 0 , \pm 1 , \pm 2 , \ldots \right\}$
C) $\left\{ \frac { \pi } { 2 } + \mathrm { n } \pi \mid \mathrm { n } = 0 , \pm 1 , \pm 2 , \ldots . \right\}$
D) $\left\{ \frac { 3 \pi } { 4 } + 2 \mathrm { n } \pi , \frac { 5 \pi } { 4 } + 2 \mathrm { n } \pi \mid \mathrm { n } = 0 , \pm 1 , \pm 2 , \ldots . \right\}$

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