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dakid91 Group Title

Use the double angle formula to rewrite the equation y = 4sin^2 (slashed zero) - 2.

  • 2 years ago
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  1. tdabboud Group Title
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    is the slashed zero theta?

    • 2 years ago
  2. dakid91 Group Title
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    Yes.

    • 2 years ago
  3. tdabboud Group Title
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    it reduces to \[y = -2 \cos(2\theta)\]

    • 2 years ago
  4. dakid91 Group Title
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    Can you show me how it works?

    • 2 years ago
  5. tdabboud Group Title
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    You need to simply use that cos(2A) = 1- 2 sin^2(A)

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  6. tdabboud Group Title
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    so from this we take theta to be A

    • 2 years ago
  7. tdabboud Group Title
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    if you rewrite the equation you gave in that form it becomes.. -2 + 4sin^2(A)

    • 2 years ago
  8. tdabboud Group Title
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    from here we can factor out a -2 which leaves us with -2(1-2sin^2(A)) and you can see that the values under the parenthesis is just cos(2A) from the identity. So the answer you end up with after plugging in theta for A, is just -2cos(2Theta)

    • 2 years ago
  9. tdabboud Group Title
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    do you understand?

    • 2 years ago
  10. dakid91 Group Title
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    Yes. Thank you for giving a detailed explanation.

    • 2 years ago
  11. tdabboud Group Title
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    yeah no problem, glad i could help

    • 2 years ago
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