Math, asked by rushil281, 11 months ago

expansion of cos(A-B-C)

Answers

Answered by hrn21agmailcom

2

Answer:

see below

Step-by-step explanation:

cos(A-B-C)

= cos[A-B)-C]

= cos (A-B)cosC + sin(A-B)sinC

= (cosA cosB + sinA sinB ) cosC + ......

now u can continue.....

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