Question

( ´･･)ﾉ(._.`) Помогите...

Answer 1

$\sin( \frac{\pi(x - 3)}{4} ) = - \frac{ \sqrt{2} }{2}$

$\sin( \frac{\pi \: x - 3\pi}{4} ) = - \frac{ \sqrt{2} }{2}$

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$\frac{x\pi - 3\pi}{4} = - \frac{\pi}{4} + 2k\pi$

$\frac{x\pi - 3\pi}{4} = \frac{ - 3\pi}{4} + 2k\pi$

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$x\pi - 3\pi = - \pi + 2k\pi$

$x\pi - 3\pi = - 3\pi + 2k\pi$

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$x\pi = 2k\pi$

$x\pi = 2k\pi$

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$x = 2k$

Ответ: 2k, k€Z