Posted by Jon on Wednesday, February 13, 2008 at 12:40pm.
1)Find the amplitude of y=6cos4theta
A)3/2
B)6
C)4
D)pi/2
I chose B
2)Find the period of y=tan5theta
A)10pi
B)2pi/5
C)5pi
D)pi/5
I chose D
3)Find the phase shift of y=sin(theta3pi/4).
A)3pi/4
B)3pi/4
C)4pi/3
D)4pi/3
I chose A
4)Find the vertical shift of y=4sec theta+7.
A)4
B)7
C)7
D)4
I chose C
5)Find sec theta if tan theta=1/4 and 180 degrees<theta<270 degrees.
A)square root of 15/4
B)square root of 15/4
C)square root of 17/4
D)square root of 17/4
I chose C

math  Reiny, Wednesday, February 13, 2008 at 2:02pm
In #5, the angle is in the third quadrant, so the cosine, and hence the secant, is negative.
sec theta = (√17)/4

math  Jon, Wednesday, February 13, 2008 at 2:07pm
are the rest ok?

math  Reiny, Wednesday, February 13, 2008 at 3:20pm
yes
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