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If x=rsinAcosB,y=rsinASinB and z= r cosA find the value of $$x^{2}+y^{2}+z^{2}$$
$$2r^{2}$$
$$\frac{3}{2} r^{2}$$
$$r^{2}(cos^{2}B+cos^{2}A)$$
$$r^{2}$$
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