SOLUTION: How do I simplify (sinx - cosx)(sinx + cosx)?

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Question 1176941: How do I simplify (sinx - cosx)(sinx + cosx)?
Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!

%28sin%28x+%29-+cos%28x%29%29%28sin%28x%29+%2B+cos%28x%29%29.....note: use the difference of squares a%5E2-b%5E2=%28a-b%29%28a%2Bb%29
=sin%5E2%28x+%29-+cos%5E2%28x%29
=-cos%282x%29