Sunday

September 21, 2014

September 21, 2014

Posted by **sqleung** on Saturday, March 1, 2008 at 2:27am.

1 / cos4x

If there are any working out, could you be kind enough to show your steps? Thankyou. All help is of course, appreciated.

- Trig -
**Reiny**, Saturday, March 1, 2008 at 8:12am1/cos4x is real as long as cos4x is not equal to zero.

the period of cos4x is 2pi/4 or pi/2 (90º)

so the first time that cos4x is zero is at x=pi/8

repeatedly adding or subtracting pi/4 (45º) to this will give us another zero.

so the domain for 1/cos4x is

x is any real number except x = pi/8 ± kpi/4 where k is an integer.

Of course y = 1/cos4x is the same as

y = sec 4x, which would have vertical asymptotes at the values of x described above.

**Answer this Question**

**Related Questions**

trig - can you please show me in steps how to find f(1+a) in this equation f(x...

Algebra - Help please-I'm doing something wrong- Solve 8x^2 + 6x + 5 = 0 I'm ...

Trig - Hi. Can somebody help me solve this equaton with EXACT answers? ----- ...

algebra - 12-6x=3[2-4(x-6)] I KNOW THE ANSWER IS 11 BUT EVERYTIME I DO THE STEPS...

Algebra 2 Urgent! please Help! - simplfy (10x^2-6x-x^3)+(9x+x^3+5x^2) please ...

Math - If f(x)-lnx,g(x)=e^8x, and h(x)=x^7, find the following: a. (f.g)(x). ...

math - K is the midpoint of JL JL=4x-2 and JK=7. find x, KL, and JL. Very ...

college algebra - For the given functions f and g find the following and state ...

trigonometry HELP pleasE! - these must be written as a single trig expression, ...

math ergent please please... - 10.a)Solve the inequality x^3-5x^2+2x+8<0 by i...