fatima0520
  • fatima0520
can someone explain how to do this? plz
Trigonometry
jamiebookeater
  • jamiebookeater
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fatima0520
  • fatima0520
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anonymous
  • anonymous
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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