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Igoryamba
4 years ago
15

2. X^2=81 3. x^2=64 4. X^2=100 5. X ^2=121

Mathematics
1 answer:
Gnesinka [82]4 years ago
4 0
X² = 81
x = \pm√81
x = \pm9

x² = 64
x = \pm√64
x = \pm8

x² = 100
x = \pm√100
x = \pm10

x² = 121
x = \pm√121
x = \pm11
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###

Otherwise, you can derive the same result. Let \theta=\sin^{-1}\dfrac12, so that \sin\theta=\dfrac12. \sin^{-1} is bounded, so we know -\dfrac\pi2\le\theta\le\dfrac\pi2. For these values of \theta, we always have \cos\theta\ge0.

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Read 2 more answers
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