Let f(x, y) = cos(xev*) + cos(x + ey²) , find дхду* O a. -2ye" (sin(xe") – x cos(xev*) + cos(x + e»*)) O b. 2ye (sin(xe*)+xe»* cos(xev*)+ cos(x + e»*)) 2yev* (sin(xe»*) – x cos(xev*) + cos(x + ev*)) O d. -2yey* (sin(xev*) + xe»* cos(xe»*) + cos(x + e»*))

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A: NOTE: Refresh your page if you can't see any equations. . use cross multiplication

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