No links please (ii) Using vector method prove that cos (A-B) = CosA CosB + SinA - Maths - Vector Algebra

Question

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( i i )       U sin g   v e c t o r   m e
t h o d   p r o v e   t h a t   cos   ( A - B )
  =   C o s A   C o s B   +   S i n A
  S i n B

Neha Sethi · Accepted Answer

So |α||β|cos(A-B) = cosAcosB + sinAsinB⇒cos(A-B) = cosAcosB + sinAsinB

No links please ( i i ) U sin g v e c t o r m e t h o d p r o v e t h a t cos ( A - B ) = C o s A C o s B + S i n A S i n B .