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fatima0520

  • one year ago

can someone explain how to do this? plz

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  1. fatima0520
    • one year ago
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  2. anonymous
    • one year ago
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    Well, first you need to study what's under the square root. (1-cos)*(1+cos) - which is 1 - cos^2. It's a formula that's well known: (a+b)(a-b)=a^2-b^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, 1-cos^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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