Trigonometric Identities Worksheet With Answers Page 9
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25Since θ is in the third quadrant,
is negative.
13-1 Trigonometric Identities
Therefore,
.
Find the exact value of each expression 270 ° < θ < 360 °
17. If
, find sin θ.
SOLUTION:
Since θ is in the fourth quadrant,
is negative.
Therefore,
.
18. If
, find sec θ.
SOLUTION:
Since θ is in the fourth quadrant,
is positive.
Therefore,
.
19. If
, find cos θ.
SOLUTION:
20. If
, find cos θ.
SOLUTION:
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