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**1. Homework Statement**

Convert the point `(rho,theta,phi) = (6, (5pi)/4, pi/2)` to Cartesian coordinates. Give answers as positive values, either as expressions, or decimals to one decimal place.

**3. The Attempt at a Solution**

{x}=r*sintheta*cosphi

{y}=r*sintheta*sinphi

{z}=r*costheta

So

x = 6*sin(5pi/4)*cos(pi/2)

y = 6*sin(5pi/4)*sin(pi/2)

z = 6*cos(5pi/4)

x = 0

y = -4.242640687 (+2pi)

z = -4.242640687 (+2pi)

What did I do wrong?