Question

arcsin (x-1)=4π÷3

Срочно крк
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Answer 1

$\arcsin (x - 1) = \frac{4\pi}{3} \\ \arcsin(x - 1) \in [ - \frac{\pi}{2} ; \frac{\pi}{2} ] \\ \frac{4\pi}{3} \notin [ - \frac{\pi}{2} ; \frac{\pi}{2} ] \\ \Rightarrow \: x \in \varnothing$

Ответ: ∅