Ask your own question, for FREE!
Mathematics 28 Online
OpenStudy (anonymous):

tan-1 (1/7) + tan-1 (1/13) = tan-1(2/9)

OpenStudy (anonymous):

I suggest you check your answer using a calculator.

OpenStudy (anonymous):

hmm we have to prove it

Can't find your answer? Make a FREE account and ask your own questions, OR help others and earn volunteer hours!

Join our real-time social learning platform and learn together with your friends!
Can't find your answer? Make a FREE account and ask your own questions, OR help others and earn volunteer hours!

Join our real-time social learning platform and learn together with your friends!