E Erik New member May 4, 2010 #1 Prove: 2arctan((1/2))-arctan((1/7))=(?/4) (without using the computer -verifying the result on the computer does not "prove" the result). [Hint: verify that : tan(2arctan((1/2))-arctan((1/7)))=1. You will need the appropriate trig identities].
Prove: 2arctan((1/2))-arctan((1/7))=(?/4) (without using the computer -verifying the result on the computer does not "prove" the result). [Hint: verify that : tan(2arctan((1/2))-arctan((1/7)))=1. You will need the appropriate trig identities].
