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Homework Statement
h(sph)=exp(r2sin2([tex]\theta[/tex])sin2([tex]\phi[/tex])+r2cos2([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 (2r2sin2([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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