- How to solve ((cosxy)+(x/y))dx+1+((x/y)cos(x/y))dy=0 please help?

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How smart does one have to be, to be an engineer? When engineers work together, does one of them feel intimidated because another is smarter? How do I use de Moivre's formula to evaluate (cos pi/7 + i sin pi/7) ^7 in cartesian form? Why can't other alcohols be added to gasoline instead of ethanol? How can we differentiate between alcohol and ether by chemical tests? Im having trouble on these last 2 biology questions I have. Any help would be great. Thank You.?