Find the value of x (in degrees) for:
cos(6x+5) = 1/sec(4x+15)
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Here are some hints:
Now when we say cos(a)=cos(b)
it is not sufficient to conclude a=b
You must remember that
this is true for any trigonometric function.
Each triginometric function has also parity characteristics. It can be either even f(x)=f(-x)
or odd f(-x)=-f(x)
cosine is an even function, thus we gen another possibility for the equation:
So we have infinite number of possible solutions to the equations that come in pairs for any integer number n. Make sure you account for all of them.
If you get stuck, you can look at the attached solutions.© BrainMass Inc. brainmass.com December 24, 2021, 5:06 pm ad1c9bdddf>