Solve for ϕ
ϕ=2\pi n_{1}+\arccos(\frac{20}{21})\text{, }n_{1}\in \mathrm{Z}
ϕ=2\pi n_{2}+2\pi -\arccos(\frac{20}{21})\text{, }n_{2}\in \mathrm{Z}
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Examples
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{ x } ^ { 2 } - 4 x - 5 = 0
Trigonometry
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Linear equation
y = 3x + 4
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Matrix
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Simultaneous equation
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Differentiation
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Limits
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