= 2·(π/6) - 7·(π/4) = (π/3) - (7π/4) = (4π - 21π)/12 = -17π/12,
π ≈ 3,1415
-17·3,1415/12 ≈ -4,45
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= 2·(π/6) - 7·(π/4) = (π/3) - (7π/4) = (4π - 21π)/12 = -17π/12,
π ≈ 3,1415
-17·3,1415/12 ≈ -4,45