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anonymous
 one year ago
can someone explain how to do this? plz
anonymous
 one year ago
can someone explain how to do this? plz

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anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Well, first you need to study what's under the square root. (1cos)*(1+cos)  which is 1  cos^2. It's a formula that's well known: (a+b)(ab)=a^2b^2 but if you don't know it then you might as well multiply and add each element there and see that you get to the same result. However, 1cos^2 = sin^2 because sin^2+cos^2=1 (fundamental theorem). Ergo, you now have sqrt(sin^2) which is sin.
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