Question

Pls help with this trigonometry question!

Answer 1

X^2+y^2+z^2=r^2Cos^2alphasin^2beta + r^2cos^2alphacos^2beta+ R^2sin^2 alpha

=r^2[Cos^2alpha(sin^2beta+ cos^2 beta)+sin^2 alpha]

r^2=r^2[Cos^2 alpha + sin^2 alpha]

Hence proved

Answer 2

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