√(2+√(2+√(2+2 cos⁡8θ )) ) =A cos⁡kθ, Difficult Trigonometry Problem that Could Not Be Solve by Many · Minideo

√(2+√(2+√(2+2 cos⁡8θ )) ) =A cos⁡kθ, Difficult Trigonometry Problem that Could Not Be Solve by Many

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