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\begin{align} \phi &= \frac{a+b}{a}=\frac{a}{b}\\ \\ \phi &= 1.6180339887498948482... \end{align}
TeddyBase is a playful educational app for iPhone and iPad, developed by calkoo.com team — perfect for kids and families to explore, learn, and imagine together! Learn colours, letters, shapes and more!