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Proof that cos(a+b)=cosa.cosb-sina.sinb

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Proof that cos(a+b)=cosa.cosb-sina.sinb
  • 3 answers

Mahesh Kadian 6 years, 3 months ago

It's in ncert

Pranshu Baghel 6 years, 3 months ago

See on RD sharma

Snehashish Chand 6 years, 3 months ago

It wont ask in exam just use "rattafication" And do questions based on this formula Memorize the cos(a+b) and cos(a-b) formula . Both formula are used for the derivation of other formulas.
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