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The next insight is to express ''r'' in terms of ''x''. The variable ''r'' is the distance of the boundary from the axis about which it is rotated:
The next insight is to express ''r'' in terms of ''x''. The variable ''r'' is the distance of the boundary from the axis about which it is rotated:
:<math>r = \sqrt 2 - \sec{x}}\,{\cos{x}}</math>
:<math>r = \sqrt 2 - \sec{x}\,\cos{x}</math>
[[category:mathematics]]
[[category:mathematics]]
[[category:calculus]]
[[category:calculus]]