To state: The function $y=−cosx$ as a phase of shift of $y=sinx$ .

The phase of shift is $y=sinx−π2$ .

Given information:

The given function is $y=−cosx$ .

Explanation:

Consider the given function: $y=−cosx$

Compare the function $y=−cosx$ with the standard function $y=asinbx$ .

Then the values are $a=−1 and b=1$ .

Here $a$ is the amplitude of the function and its value is 1.

Now find the period of the function.

$Period=2πb$

Substitute the values $b=1$ in the formula:

$Period=2π1=2π$

The minus sign in the given function $y=−cosx$ shows that its graph is reflected across x- axis, so its maximum value is at $π$ on the other hand the maximum of the function $y=sinx$ is at $π2$ .

So the shift of the graph $y=−cosx$ is $π2$ units right from the graph of $y=sinx$ .

$y=−cosxy=sinx−π2$

Therefore, the phase of shift is $y=sinx−π2$ .

Chapter 4.4, Problem 41E

Chapter 4.4, Problem 43E

Chapter 4 Solutions

PRECALCULUS:GRAPHICAL,...-NASTA ED.

Ch. 4.1 - Prob. 1QR Ch. 4.1 - Prob. 2QR Ch. 4.1 - Prob. 3QR Ch. 4.1 - Prob. 4QR Ch. 4.1 - Prob. 5QR Ch. 4.1 - Prob. 6QR Ch. 4.1 - Prob. 7QR Ch. 4.1 - Prob. 8QR Ch. 4.1 - Prob. 9QR Ch. 4.1 - Prob. 10QR

Ch. 4.1 - Prob. 1E Ch. 4.1 - Prob. 2E Ch. 4.1 - Prob. 3E Ch. 4.1 - Prob. 4E Ch. 4.1 - Prob. 5E Ch. 4.1 - Prob. 6E Ch. 4.1 - Prob. 7E Ch. 4.1 - Prob. 8E Ch. 4.1 - Prob. 9E Ch. 4.1 - Prob. 10E Ch. 4.1 - Prob. 11E Ch. 4.1 - Prob. 12E Ch. 4.1 - Prob. 13E Ch. 4.1 - Prob. 14E Ch. 4.1 - Prob. 15E Ch. 4.1 - Prob. 16E Ch. 4.1 - Prob. 17E Ch. 4.1 - Prob. 18E Ch. 4.1 - Prob. 19E Ch. 4.1 - Prob. 20E Ch. 4.1 - Prob. 21E Ch. 4.1 - Prob. 22E Ch. 4.1 - Prob. 23E Ch. 4.1 - Prob. 24E Ch. 4.1 - Prob. 25E Ch. 4.1 - Prob. 26E Ch. 4.1 - Prob. 27E Ch. 4.1 - Prob. 28E Ch. 4.1 - Prob. 29E Ch. 4.1 - Prob. 30E Ch. 4.1 - Prob. 31E Ch. 4.1 - Prob. 32E Ch. 4.1 - Prob. 33E Ch. 4.1 - Prob. 34E Ch. 4.1 - Prob. 35E Ch. 4.1 - Prob. 36E Ch. 4.1 - Prob. 37E Ch. 4.1 - Prob. 38E Ch. 4.1 - Prob. 39E Ch. 4.1 - Prob. 40E Ch. 4.1 - Prob. 41E Ch. 4.1 - Prob. 42E Ch. 4.1 - Prob. 43E Ch. 4.1 - Prob. 44E Ch. 4.1 - Prob. 45E Ch. 4.1 - Prob. 46E Ch. 4.1 - Prob. 47E Ch. 4.1 - Prob. 48E Ch. 4.1 - Prob. 49E Ch. 4.1 - Prob. 50E Ch. 4.1 - 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