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let 0ltphiltpi/2, x=sum(n=0)^oocos^(2n)p...

let `0ltphiltpi/2`, `x=sum_(n=0)^oocos^(2n)phi`, `y=sum_(n=0)^oosin^(2n)phi` and `z=sum_(n=0)^oocos^(2n)phisin^(2n)phi`

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The correct Answer is:
`a/(1-r)+(dr)/((1-r)^(2))`
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