Simplify (1 − sin x)(1 + sin x).

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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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HI!!
Hello
multiply out you get \[1-\sin^2(x)\]

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then use a famous identity to rewrite it
Oh wow the first step was simple enough, but I'm not sure what you're talking about by a certain "famous identity"
the mother of all trig identities is \[\cos^2(x)+\sin^2(x)=1\] so \[1-\sin^2(x)=\cos^2(x)\]
Aka Pythagorean Identity.
Okay, now I got it. Thank you very much! ^_^

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