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## Homework Statement

h(sph)=exp(r

^{2}sin

^{2}([tex]\theta[/tex])sin

^{2}([tex]\phi[/tex])+r

^{2}cos

^{2}([tex]\theta[/tex]))

need to find gradient of this function, i have er and etheta.... but can someone please tel me why when maple differentiates with respect to phi, why does it say it equals zero????

coz i get (2r

^{2}sin

^{2}([tex]\theta[/tex])sin([tex]\phi[/tex])cos([tex]\phi[/tex])*h)ephi

it probably some trig identity... can someone please help. ty

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