I need help with proving two trigonometric expressions:
1) tanA - tanB = tanB tan(A-B)
tanA - cotB
2) tan (x - y) + tany
tan (x - y) - coty
Thanks in advance!
hello friend, as far as i know, trig. expressions are not proven, they are usually simplified....are the above two questions identities that you want help with?
and with the second, if its proving, what do you want us to prove?
and for the first, do you want us to prove this:
Hello SallyvinkaYou don't say what you want to prove here. But perhaps it's this:2) tan (x - y) + tany
tan (x - y) - cotyGrandad, multiplying 'top-and-bottom' by