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Catsarecool97

  • one year ago

Verify that sin(x+pi/2)=cosx

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  1. AravindG
    • one year ago
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    use sin(A+B) formula

  2. primeralph
    • one year ago
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    |dw:1372182326719:dw|

  3. Catsarecool97
    • one year ago
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    Wait what?

  4. AravindG
    • one year ago
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    do you know sin(A+B) expansion?

  5. Catsarecool97
    • one year ago
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    yes. sin(x+y)=sinxcosy+cosxsiny

  6. AravindG
    • one year ago
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    ok here y=pi/2

  7. AravindG
    • one year ago
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    substitute and put values

  8. Catsarecool97
    • one year ago
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    alright so. sinxcospi/2+cosxsinpi/2

  9. AravindG
    • one year ago
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    yep

  10. AravindG
    • one year ago
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    sin pi/2= ... cos pi/2=....

  11. primeralph
    • one year ago
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    ?

  12. Catsarecool97
    • one year ago
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    sin=1 cos=0?

  13. Catsarecool97
    • one year ago
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    I'm confused now

  14. AravindG
    • one year ago
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    yes

  15. primeralph
    • one year ago
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    You know the formula. Use the formula?

  16. AravindG
    • one year ago
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    sin pi/2=1 cos pi/2=0

  17. AravindG
    • one year ago
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    Put the vales there

  18. AravindG
    • one year ago
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    *values

  19. AravindG
    • one year ago
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    sinxcospi/2+cosxsinpi/2

  20. Catsarecool97
    • one year ago
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    so sinxcos0+cosxsin1?

  21. Catsarecool97
    • one year ago
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    how does this equal cos?

  22. AravindG
    • one year ago
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    sinx *0+cosx *1=....

  23. primeralph
    • one year ago
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    |dw:1372182809686:dw|

  24. Catsarecool97
    • one year ago
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    oh! Thank you both!

  25. AravindG
    • one year ago
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    yw :)

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