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Important! this Trigonometry Calculator uses [RAD] mode or radian mode. This used for trigonometric calculation. For example cos (1) the same as cos 1 Rad.Some calculators use RAD Mode or Radian (1 RAD = 57,296°) as a standard-setting. Click [DEG] to change Degree Mode. See more

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Cos 111.4° degree mode because there is a degree symbol Sin (-18°) degree mode because there is a degree symbol Sec 9π/10 radian mode because there is no degree symbol tan 42.5 radian

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