Magnetic Field from Two Wires help?

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Homework Statement



http://session.masteringphysics.com/problemAsset/1004684/21/189576A.jpg

Point M is located a distance 2d from the midpoint between the two wires. Find the magnitude of the magnetic field created at point M by wire 1.<---Already did; answer was B_1M = ((u_0)I)/(2sqrt(5)pi*d)

I have to do this:

Find the magnitude of the net magnetic field B_M created at point M by both wires.


Homework Equations



B(wire) = ((u_0)I)/(2pi*d)


The Attempt at a Solution



I already found the angle to be 63.4 degrees, resulting in

B_M = 2*cos(63.4)((u_0)I/2pi*sqrt(d^2+(2d^2))),

but the system said that I had an incorrect multiplier...

What am I doing wrong?
 
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