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anonymous

  • one year ago

Verify the identity. Show your work. cos(α - β) - cos(α + β) = 2 sin α sin β my answer>cos=o

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  1. anonymous
    • one year ago
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    Teacher:Use the sum and difference formulas for this me:wtf you mean

  2. anonymous
    • one year ago
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    @misty1212

  3. sohailiftikhar
    • one year ago
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    cos(a-b)=cos(a)cos(b)+sin(a)sin(b) cos(a+b)=cos(a)cos(b)-sin(a)sin(b) these are the formulas

  4. anonymous
    • one year ago
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    woow ok so do i use both of them or what

  5. sohailiftikhar
    • one year ago
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    you have both terms cos(a-b) and cos(a+b) so use both

  6. sohailiftikhar
    • one year ago
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    in this problem

  7. anonymous
    • one year ago
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    ok so this is a practice question imma gonna be graded on so can you help me plz

  8. sohailiftikhar
    • one year ago
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    ok

  9. anonymous
    • one year ago
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    2cos(A)cos(B)=2cos(A)cos(B) ok so i got this instead is this right

  10. anonymous
    • one year ago
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    @misty

  11. sohailiftikhar
    • one year ago
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    no it's not right

  12. sohailiftikhar
    • one year ago
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    ok i'm going to solve it

  13. sohailiftikhar
    • one year ago
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    \[\cos(\alpha-\beta)-\cos(\alpha+\beta)=(\cos \alpha \cos \beta +\sin \alpha \sin \beta)-(\cos \alpha \cos \beta -\sin \alpha \sin \beta )\]

  14. sohailiftikhar
    • one year ago
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    now \[\cos \alpha \cos \beta +\sin \alpha \sin \beta -\cos \alpha \cos \beta +\sin \alpha \sin \beta =2 \sin \alpha \sin \beta \]

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