Asked by mysterychicken

i am homeschooled so i don't really have a teacher teaching me one on one. so most of my help comes from here.thnks..can anyone help me on this.
use identities to find the indicated function value.
secA=5/4 and A in quadrant IV. Find tan A.
A. -sqrt9/5
B. -sqrt9/4
C. -sqrt5/4
D. -sqrt9
Answered by Damon
if the sec is 5/4
then the cos is 4/5
This is a three, four, five right triangle in the fourth quadrant, so the sin is -3/5
tan = sin /cos = -3/4 which is -sqrt 9 /4
Answered by y912f
thnks
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