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Use the given transformation to evaluate the integral. \[ \iint_{R} 7 \cos \left(5\left(\frac{y-x} ...
Use the given transformation to evaluate the integral. \[ \iint_{R} 7 \cos \left(5\left(\frac{y-x}{y+x}\right)\right) d A \text { where } R \text { is the trapezoidal region with vertices }(9,0),(10,0),(0,10) \text {, and }(0,9) ; u=y-x, v=y+x \]