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typo fix
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@@ -94,7 +94,7 @@ And the distance between these two is the standard Euclidean distance:
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d_x(φ) &= T_x - P_x = \frac{1}{4}(3 + cos(φ)) - cos(\frac{φ}{2}) = 2sin^4\left(\frac{φ}{4}\right) \ , \\
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d_y(φ) &= T_y - P_y = \frac{1}{4}\left(2tan\left(\frac{φ}{2}\right) + sin(φ)\right) - sin(\frac{φ}{2}) \ , \\
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&⇓\\
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d(φ) &= \sqrt{d^2_x + d^2_y} = \ ... \ = 2sin^4(\frac{φ}{2})\sqrt{\frac{1}{cos^2(\frac{φ}{2})}}
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d(φ) &= \sqrt{d^2_x + d^2_y} = \ ... \ = 2sin^4(\frac{φ}{4})\sqrt{\frac{1}{cos^2(\frac{φ}{2})}}
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\end{aligned}
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\]
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