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Q.

If x=rcosθcosϕ,y=r cosθsinϕ, z=rsinθ, then x2+y2+z2=

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a

r2

b

y2

c

x2

d

z2

answer is A.

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Detailed Solution

x2+y2+z2=r2cos2θcos2φ+sin2φ+sin2θ
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If x=rcosθcosϕ,y=r cosθsinϕ, z=rsinθ, then x2+y2+z2=