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If a + b + C …

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If a + b + C = Pi show that Cos A + cos b + cos c=1 + 4 sin a/2 sin b/2 sin c/2
  • 2 answers

Nitin Chaudhary 6 years, 5 months ago

Same here. Dont know.

Satish Singh 6 years, 5 months ago

don't know
http://mycbseguide.com/examin8/

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