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POSTTEST Directions. Find the derivatives of the following functions: 1. y = (4x - 1) 3 2. y = V5 -t 3. y = 7-2 4. y = cos 4x 5. y = cotx sinx ACTIVITIES Directions. Use implicit differentiation to find ay 1. x2 - y2 = 8 2. x2 y + y2x = -2 3. y = sin xy 4. x = sec= 5. sinx + 2cos2y = 1 POSTTEST Directions. Use implicit differentiation to find dy . 1. x2 + y2 = 7 2. x3y3 - y - x =0 3. xey - 10x + 3y = 0 4. coty = x - y 5. sinx = x(1 + tany)