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If x r cos theta
If x r cos theta pictures 5
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If x r cos
If x r cos theta
if x r sin theta cos alpha
if x e r cos theta
if x x1 r cos theta
eliminate theta if x r cos theta
if x r cos theta y r sin theta
if x r cos theta
if x r cos theta cos phi
if x r cos theta sin phi
if x r cos theta y rsin theta then
