For an angle, u measured from the positive x - axis, the values

of sin u and cos u are always (choose one):

(a) greater than +1

(b) less than -1

(c) greater than -1 and less than 1

(d) greater than or equal to -1 and less than or equal to 1

(e) less than or equal to -1 or greater than or equal to 1.

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