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Mathematics, 12.04.2021 21:30 jamarstand

If cos θ = 0.2 , find value of cos θ + cos ( θ + 2π ) + cos ( θ - 2π )?

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If cos θ = 0.2 , find value of cos θ + cos ( θ + 2π ) + cos ( θ - 2π )?...
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