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Prove that cos(A+B)cosC - cos(B+C)cosA

  1. if cos(B-C)+cos(C-A)+cos(A-B)=-3/2 then prove that cosA+cosB+cosC=O and sinA+sinB+sinC=O after that prove that
    1. answers icon 1 answer
    2. Binoy kumar mahato asked by Binoy kumar mahato
    3. views icon 2,313 views
  2. Prove thatcos(A+B)cosC - cos(B+C)cosA = sinBsin(C-A)
    1. answers icon 1 answer
    2. Kewal asked by Kewal
    3. views icon 2,124 views
  3. I need to prove that the following is true. Thanks.csc^2(A/2)=2secA/secA-1 Right Side=(2/cosA)/(1/cosA - 1) =
    1. answers icon 0 answers
    2. Dirk asked by Dirk
    3. views icon 965 views
  4. IfA+B+C=180°than prove that cosA+cosB-cosC=4cosA/2.sinB/2.cisC/2
    1. answers icon 1 answer
    2. ss0108982 asked by ss0108982
    3. views icon 324 views
  5. If sina+7sinb=4 (sinc+2sind) and cosa+7cosb=4 (cosc+2cosd), how do I prove that 2cos(a-d) =7cos(b-c)?
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    2. Alexa asked by Alexa
    3. views icon 877 views
  6. If sina+7sinb=4 (sinc+2sind) and cosa+7cosb=4 (cosc+2cosd), how do I prove that 2cos(a-d) =7cos(b-c)?
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    2. Anonymous asked by Anonymous
    3. views icon 442 views
  7. Prove that [sinA/(1-cosA)-(1-cosA)/sinA]*[cosA/(1+sinA)+(1+sinA)/cosA]=4cosecAI the second part as 2 secA
    1. answers icon 1 answer
    2. Agastya asked by Agastya
    3. views icon 733 views
  8. If 1-cosA=5/13, prove that 25sinA(sinA - cosA)
    1. answers icon 1 answer
    2. Dipankar asked by Dipankar
    3. views icon 480 views
  9. CosA+cosB-cosC=4COSA/2 cosB/2 SINC/2-1
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    2. Hansika asked by Hansika
    3. views icon 982 views
  10. CosA/1+sinA=1-sinA/cosAI have to prove the identity each side has to b the same how would i do that? I have a unit test on
    1. answers icon 5 answers
    2. Kristien asked by Kristien
    3. views icon 621 views