1. ## sin, cos simplifying

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2. I'm guessing you mean ...

$\frac{\cos^2{C}-\sin^2{C}}{\cos{C} - \sin{C}}$

if so, then notice that the numerator is the difference of two squares, and will factor.

then maybe something will divide out, you think?

btw ... in future use grouping symbols to make your expressions more clear to those that read them.

3. Originally Posted by skeeter
I'm guessing you mean ...

$\frac{\cos^2{C}-\sin^2{C}}{\cos{C} - \sin{C}}$

if so, then notice that the numerator is the difference of two squares, and will factor.

then maybe something will divide out, you think?

btw ... in future use grouping symbols to make your expressions more clear to those that read them.
Please quote the question (if there was anything to quote) else we are all mistified when the OP deletes the text of their question.

CB