Math  /  Trigonometry

Question285 cosα=23e32π<α<2π;sinα\cos \alpha=\frac{2}{3} \mathrm{e} \frac{3}{2} \pi<\alpha<2 \pi ; \sin \alpha ? 186 197sinα=1213eb197 \sin \alpha=-\frac{12}{13} \mathrm{e} b \in III quadrante; cosα\cos \alpha ? 138sinα=53138 \sin \alpha=\frac{\sqrt{5}}{3} e bb \in II quadrante; cosα\cos \alpha ?

Studdy Solution
Per il primo problema, sinα=53\sin \alpha = -\frac{\sqrt{5}}{3}. Per il secondo problema, cosα=513\cos \alpha = -\frac{5}{13}. Per il terzo problema, cosα=23\cos \alpha = -\frac{2}{3}.

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