prove that cosA+cosB-cosC=-1+4cosA/2cosB/2sinC/2

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  2. prove that cosa cosb-cosc=-1 4cosa/2.cosb/2.sinc/2
  3. prove that cos2a cos2b cos2c=-4.cosa.cosb.cosc-1
  4. then prove that
  5. prove that cos2a cos2b-cos2c=1-4cosa.cosb.cosc
  6. prove that cosa cosb cosc=1 4.sina/2.sinb/2.sinc/2
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