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Sagot :
To answer this question we will use the following diagram as reference:
The above diagram helps us remember the sign of the cosine and sine functions depending on the quadrant.
If sin(t)<0 and cos(t)<0 then t is in quadrant III.
If sin(t)>0 and cos(t)<0 then t is in quadrant II.
Answer:
(a) III.
(b) II.

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