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Precalculus
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OpenStudy (anonymous):
(1-sinx)(1+sinx)
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OpenStudy (mathstudent55):
What do you need to do? What are the instructions?
OpenStudy (anonymous):
= cos^2x
OpenStudy (mathstudent55):
Ok. Multiply out the left side. What do you get? Do you see a pattern on the left side similar to (a - b)(a + b)? What is the product on the left side? You can also use FOIL.
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