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A non-permissible value of x for the function $f(x) = \frac{1}{\cos x + 1}$ is: -1 0 $\pi$ $\frac{3\pi}{2}$ 

          A non-permissible value of x for the function $f(x) = \frac{1}{\cos x + 1}$ is:
-1
0
$\pi$
$\frac{3\pi}{2}$
A non-permissible value of x for the function f(x) = (1)/(cos x + 1) is: -1 0 π (3π)/(2)

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Precalculus with Limits
Precalculus with Limits
Ron Larson 2nd Edition
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A non-permissible value of x for the function f(x)=(1)/(cosx+1) is: -1 0 pi (3pi )/(2) 1 A non-permissible value of x for the function fx= is: 1+xs00 3T 2
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Transcript

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00:01 Question number 18, d square y over d x square is equal to 3 into sine x minus 4y.
00:20 So, d square y over d x square plus 4y is equal to 3 sinex.
00:33 M square plus 4 is equal to 0.
00:37 So m is equal to plus minus iota 2.
00:45 Hence y is equal to a cos of 2x plus b sine of 2x now let y is equal to c cause x plus d sine x so d y over d x is equal to minus c sine x plus d cause x and d sky over d x square is equal to minus c cause x minus d sine x hence the equation becomes minus c cause x minus d sinex plus four c cause x plus 4d sine x is equal to 3 sine x so the simplified form equation would become 3c cause x plus 3d sine x is equal to 3 sine x so comparing the equation value of c is equal to 0 d is equal to 1 so, y is equal to sine of x.
02:34 From here, general equation would become y is equal to a cause of 2x plus b, sine of 2x plus sine x.
02:55 Y is equal to 0 when x is equal to 0.
03:01 So, a is equal to 0.
03:04 D .y over d x is equal to 1, when x is equal to pi by two so d y over d x is equal to minus two a now d y over d x is equal to minus two a sign of two x plus two b cause of two x plus cause of x so from here b is equal to minus 1 over 2...
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