PreCalculuscheck answers
posted by Lucy .
State the period and phase shift of the function y=4tan(1/2x + 3pi/8)
a) 2pi, 3pi/4
b) pi, 3pi/8
c) 2pi, 3pi/8
d) pi, 3pi/8
Answer: d
2) What is the equation for the inverse of y=cos x+3:
a) y=Arccos(x+3)
b) y=Arccos x3
c) y=Arccos x+3
d) y=Arccos(x3)
Answer:d
Thanks for your help

PreCalculuscheck answers 
Reiny
in y=4tan(1/2x + 3pi/8)
y = 4 tan (1/2)[x + 3pi/4]
so the period is 2pi/(1/2) = 4pi which is none of your choices.
Did you type your questions or answers correctly??
the phase shift would be 3pi/4 radians to the left.
2)
the inverse of y = cos x+3 is x = cos y+3
then cos y = x3
and y = arccos(x3) 
PreCalculuscheck answers 
Lucy
I double checked my typing on the first problem and everything was entered correctly.

PreCalculuscheck answers 
Reiny
then the book is wrong

PreCalculuscheck answers 
Lucy
I am not surprised as I have found many errors thus far.
Thanks for helping
Respond to this Question
Similar Questions

PreCalculuscheck answers
Write an equation of the tangent function with period 3pi/8, phase shift pi/5, and vertical shift 2. Answer: y=tan(8x/3  8pi/15)2 Thanks 
PreCal(Please check)
1) Find the Asymptotes: y = 2 sec 2pi x pi/2b and 3pi/2b pi/2(2pi) = pi/4 and 3pi/4 Is this correct? 
Calculus
Determine whether the curve has a tangent at the indicated point. f(x)= sin x 0<x<3pi/4 cos x 3pi/4<x<2pi at x = 3pi/4 
trig
Solve the equation for cos thetatan theta=0 for greater than or egual to zero but less than 2pi. Write your answer as a multiple of pi, if possible form the following choices: pi , 5pi A.   4___ 4 B. pi 3pi 5pi 7pi  ' … 
calculus
given the graph of f(x) = x sinx, 0<=x<=2pi assuming that a quantity y changes at a rate of y' = xsinx, find by how much it will increase or decrease over 3pi/2 <= x <= 2pi the area under the graph from 0 to pi/2 is 1 the … 
Analysis
Find the amplitude, period, and phase shift of the functions: f(x)=4sec(x+3pi/2) f(x)=tan((1/3t)pi) f(x)=5sin(4t+3pi) 
trig
Solve cos x1 = sin^2 x Find all solutions on the interval [0,2pi) a. x=pi, x=pi/2, x= 2pi/3 b. x=3pi/7, x=pi/2, x=2pi/3 c. x=3pi/7, x=3pi/2, x=3pi/2 d. x=pi, x=pi/2, x=3pi/2 
Trigonometry
4. Write the equation of the cosine function with an amplitude of 1/3, a period of 2pi, and a phase shift of 3pi/2. I got 1/3COS(1/2x3pi), but I really do not think that is correct D: any tips or advice? 
pre cal
cosA (7/25) pi < A < 3pi/2 sin B= 3/5 3pi/2 <B<2pi 
Algebra 2
What values for theta(0 <= theta <= 2pi) satisfy the equation?