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  1. What is the definition of angle in conformal mappings and how can we find angle between them for example if $\gamma_1(t)= \sin t$ and $\gamma_2(t)= \exp(it)$ then at $t=0$ find angle.
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    also I dont know more about this, but a very intelligent person asked me this question. also he asked me what is the definition of this angle,2012-06-02

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Parametrise $z = z(t)$, with $z:(0,1) \to \mathbb{C}$. Then write $w(z(t)) = f(z(t))$ and consider by the chain rule $\mathrm{arg}(\dot w(z(t))) = \mathrm{arg}(f'(z(t)) \dot z(t)) = \mathrm{arg}(f'(z(t))) + \mathrm{arg}( \dot z(t))$

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    I have no idea why you dug up a question that's over a year old, especially since it's so badly formulated. Look carefully at the OP's parametrization of $\gamma_1$.2013-06-06