### Possible Answer

What does csc 0, sec 0, tan 0 equal? what about for pi/2 and 2 pi? ... 2pi = 360 degrees sin 360 = 0, cos 360 = 1, tan 360 = 0 So csc 360 = undefined, sec 360 = 1 . Source(s): - read more

... the two non-right angles total 90° (π/2 radians), so each of these angles must be in the range of (0°,90°) as expressed in interval notation. ... The cosecant csc(A), ... This means that the second derivative of a sine in degrees does not satisfy the differential equation. - read more

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