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IF A+B+C = 180 THEN COS^2A + COS^2B – COS^2C =

IF A+B+C = 180 THEN COS^2A + COS^2B – COS^2C =

Grade:11

1 Answers

Nishant Vora IIT Patna
askIITians Faculty 2467 Points
7 years ago
Hello student, Please find the answer to your question below

use the following formula for the first 2 terms,
CosC + CosD = 2Cos[(C+D)/2]Cos[(C-D)/2]
then cos 2c is cos (2pi – (2A + 2 B))

Now you can simplify and get the answer….….….….

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