Help with identities math problem?

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The question asks you to simplify sin(3pi/2+x).

I know that you've got to use the sin(a+b)=sinacosb+cosasinb

but I'm not sure how to solve it when it's not a special triangle.

Any help is much appreciated.
 
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Nevermind, figured out my silly mistake.
 

Thread 'Family of lines that are at a distance of 5 from the origin'

I picked up this problem from the Schaum's series book titled "College Mathematics" by Ayres/Schmidt. It is a solved problem in the book. But what surprised me was that the solution to this problem was given in one line without any explanation. I could, therefore, not understand how the given one-line solution was reached. The one-line solution in the book says: The equation is ##x \cos{\omega} +y \sin{\omega} - 5 = 0##, ##\omega## being the parameter. From my side, the only thing I could...
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