anonymous
  • anonymous
If sin theta=3/5 and theta is in quad 2 the exact form of cos (2theta) is I just need my work to be checked! because I got postive or neg sqrt -1/2
Mathematics
jamiebookeater
  • jamiebookeater
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welshfella
  • welshfella
cos (2theta0 = 1 - 2sin^2 theta
anonymous
  • anonymous
Yeah I got that far knowing which formula to use
anonymous
  • anonymous
so 1-2*(3/5)^2

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welshfella
  • welshfella
= 1 - 2*9/25
anonymous
  • anonymous
Wait how tho?
anonymous
  • anonymous
Thats not what I got at all lol
anonymous
  • anonymous
7/25
welshfella
  • welshfella
yes
anonymous
  • anonymous
But how? It doesnt make sense lol @welshfella
welshfella
  • welshfella
I'm assuming you mean 'cos 2 theta' not 'cos theta squared'?
anonymous
  • anonymous
Yes exactly. Is it that simple then? Haha I was solving for sin @welshfella
anonymous
  • anonymous
I do mean cos2theta
welshfella
  • welshfella
yes - you just substitute 3/5 for sin theta
anonymous
  • anonymous
Ohhhh I see @welshfella

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