Толковый словарь английского языка - cosecant
Cosecant
cosecant
noun Etymology: New Latin ~-, cosecans, from co+ secant-, secans secant Date: circa 1706 a trigonometric function that for an acute angle is the ratio between the hypotenuse of a right triangle of which the angle is considered part and the leg opposite the angle, a trigonometric function csc θ that is the reciprocal of the sine for all real numbers θ for which the sine is not zero and that is exactly equal to the ~ of an angle of measure θ in radians
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n. Math. the ratio of the hypotenuse (in a right-angled triangle) to the side opposite an acute angle; the reciprocal of sine. Etymology: mod.L cosecans and F cos{eacute}cant (as CO-, SECANT) ...Толковый словарь английского языка Oxford English Reference
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