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hothand621

(sinA+cosAtanB)/(cosA-sinAtanB)=tan(a+b)

  • 11 months ago
  • 11 months ago

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  1. AravindG
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    Multiply with cos B on numerator and denominator.

    • 11 months ago
  2. hothand621
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    explain?

    • 11 months ago
  3. AravindG
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    you will se that you get something similar to previous question

    • 11 months ago
  4. AravindG
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    (sinA+cosAtanB) X cos B ________________________ (cosA-sinAtanB) X cos B

    • 11 months ago
  5. AravindG
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    Try opening up the brackets .

    • 11 months ago
  6. hothand621
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    ok, so you get this: \[(sinAcosB+cosAcosBtanB)/(cosAcosB-sinAcosBtanB)\] so what next?

    • 11 months ago
  7. AravindG
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    tan B X cos B = ?

    • 11 months ago
  8. hothand621
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    ?

    • 11 months ago
  9. AravindG
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    \[\tan B \times \cos B= .....\] Can you find that ?

    • 11 months ago
  10. AravindG
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    @hothand621 ?

    • 11 months ago
  11. hothand621
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    ummmm no, i suck at harder trig

    • 11 months ago
  12. RolyPoly
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    Hint: tan B = sinB / cosB

    • 11 months ago
  13. AravindG
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    ^^

    • 11 months ago
  14. hothand621
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    yes and that doesnt equal tan(a+b)

    • 11 months ago
  15. hothand621
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    it equals sinB

    • 11 months ago
  16. RolyPoly
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    Simplify it first :) No need to be hurry :)

    • 11 months ago
  17. AravindG
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    yep replace it in your question

    • 11 months ago
  18. hothand621
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    replace what though

    • 11 months ago
  19. AravindG
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    (sinA+cosAtanB) X cos B = sin A cos B+cos A sin B !

    • 11 months ago
  20. AravindG
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    Seen that somewhere?

    • 11 months ago
  21. hothand621
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    yes

    • 11 months ago
  22. AravindG
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    Can you do it now ?

    • 11 months ago
  23. hothand621
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    ummm give me a minute

    • 11 months ago
  24. hothand621
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    i think so

    • 11 months ago
  25. hothand621
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    what happens to the denominator?

    • 11 months ago
  26. AravindG
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    Open up the brackets !

    • 11 months ago
  27. AravindG
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    (cosA-sinAtanB) X cos B=.........

    • 11 months ago
  28. hothand621
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    thanks man, solved :)

    • 11 months ago
  29. AravindG
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    Great ! yw :)

    • 11 months ago
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