Using equivalent and fundamenta. angles, we find that:
a) 
b) 
c) 
d) 
Item a:
is an angle in the third quadrant, as 
It's equivalent in the first quadrant is:
, which is a fundamental angle, which means that it's values of sine, cosine and tangent are known.
Sine in the third quadrant is negative, while in the first is positive, thus:

Item b:

Thus, it is equivalent to an angle of
, which is in the fourth quadrant.
It's equivalent on the first quadrant is:

Cosine in the fourth quadrant is positive, just as in the first, thus:

Item c:

Which is a angle in the third quadrant.
It's equivalent in the first is:

Sine in the third quadrant is negative, while in the first is positive, thus:

Item d:

Which is in the third quadrant.
Cosine in the third quadrant is negative, while in the first is positive, thus:

A similar problem is given at brainly.com/question/23843479