Question

cos(a-b-c) expand it

Answer 1

Answer:

Cos(a-b-c)= =Cos a Cos b Cos c +Sin a Sin b Cos c + Sin a Cos b Sin c - Cos a Sin b Sin c.

Step-by-step explanation:

Cos(a-b-c)

= Cos((a - b) -c))

= Cos(a-b)Cos c + Sin (a-b)Sin c

=( Cos a Cosb + Sin a Sin b)Cos c +( Sin a Cos b - Cos a Sin b)Sin c

=Cos a Cos b Cos c +Sin a Sin b Cos c + Sin a Cos b Sin c - Cos a Sin b Sin c.

Answer 2

Answer:

hope this will help you

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