Back an earlier chapter with this section. I'm just going to simplify this equation real quick. It's really basic but it's enough to get an idea of what to do and which function to use.
Simplify: sin^2 - 1
Now, for this trig function you would use either sin^2x + cos^2x = 1, 1 + tan^2x = sec^2x, or 1 + cot^2x = csc^2x
Since their is only one function that has sin^2 and a 1 in it, you would use sin^2x + cos^2x = 1 to simplify.
So what you do now is basically make the pythagorean relationship equal to sin^2 - 1 and what your left with on the other side of the equal sign, is your simplified answer.
So subtract the cos^2x and the 1 and get -cos^x as a final answer.
~ Parrish Masters
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