drwls and I have answered about 5 of your questions based on the same type of trig expansions.
You have not given a single sign showing any effort on your part to solve these problems.
Show us how far you got in solving these problems and perhaps we can give you a hint on how to continue.
There is also no indication that you have even looked at our solutions to your problems.
Prove that
cos(A+B+C)+cos(-A+B+C)+cos(A-B+C)+cos(A+B-C)/sin(A+B+C)+sin(-A+B+C)-sin(A-B+C)+sin(A+B-C) = cotB
1 answer
3 answers