Evaluate $\iint _ { R } \frac { \sin ( x + y ) } { \cos ( x - y ) } d A$ ,where R is the rectangular region bounded by the lines x + y = 0, $x + y = \frac { \pi } { 2 }$ , x - y = 0, and $x - y = \frac { \pi } { 4 }$ .

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The Answer of Evaluate $\iint _ { R } \frac { \sin ( x + y ) } { \cos ( x - y ) } d A$ ,where R is the rectangular region bounded by the lines x + y = 0, $x + y = \frac { \pi } { 2 }$ , x - y = 0, and $x - y = \frac { \pi } { 4 }$ .

Evaluate ∬Rsin⁡(x+y)cos⁡(x−y)dA\iint _ { R } \frac { \sin ( x + y ) } { \cos ( x - y ) } d A∬R​cos(x−y)sin(x+y)​dA

Evaluate $\iint _ { R } \frac { \sin ( x + y ) } { \cos ( x - y ) } d A$