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/ إذن، $u = \frac{1}{2}$ أو $u = -1$.
إذن، $u = \frac{1}{2}$ أو $u = -1$.
February 22, 2026
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- 2\sin^2 z = \sin z \implies 2\sin^2 z + \sin z - 1 = 0
لنفترض $u = \sin z$, إذن:
2u^2 + u - 1 = 0 \implies u = \frac{-1 \pm \sqrt{1 + 8}}{4} = \frac{-1 \pm 3}{4}
لـ $\sin z = \frac{1}{2}$:
z = 30^\circ \quad \text{أو} \quad z = 150^\circ
لـ $\sin z = -1$:
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