Ankit214
Ankit214 Ankit214
  • 16-09-2022
  • Mathematics
contestada

If A + B + C = 180° Then prove that cos2A - cos2B - cos2C = 4cosA sinB sinC - 1​

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tassasankar888
tassasankar888 tassasankar888
  • 16-09-2022

Answer:

please give the question clearly

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