Math, asked by sanjanaswain2004, 7 months ago

• Cos 2A + Cos2B + cos2C + cos2 ( A +B+C)​

Answers

Answered by ranishukla34774
1

Step-by-step explanation:

2Cos(A+B)Cos(A-B)+Cos2C+Cos2(A+B+C)2Cos(A+B)Cos(A-B)+2Cos(2C+B+A)Cos(A+B)2Cos(A+B)[Cos(A-B)+Cos(2C+B+A)]2Cos(A+B)2Cos[(A-B+2C+B+A)/2]Cos[(A-B-2C-B-A)/2]4Cos(A+B)Cos(B+C)Cos(A+C

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