# Show me how to reduce into a single term

• December 4th 2009, 04:10 PM
KarlosK
Show me how to reduce into a single term
tan (x+y) - tan y
---------------------
1+ tan(x+y) tan y

Thanks!
• December 4th 2009, 04:17 PM
bigwave
Quote:

Originally Posted by KarlosK
tan (x+y) - tan y
---------------------
1+ tan(x+y) tan y

Thanks!

do you know the difference formula for tan(x - y)

from the formula given just reverse back to this..
• December 4th 2009, 04:22 PM
KarlosK
Very vaguely. I am taking an online course and it is difficult to learn without a book. Sometimes seeing it written out helps me to understand. Otherwise I have to scour the internet looking at examples and piecing things together. Last time I ever take an online class that is for sure
• December 4th 2009, 04:37 PM
bigwave
Quote:

Originally Posted by KarlosK
Very vaguely. I am taking an online course and it is difficult to learn without a book. Sometimes seeing it written out helps me to understand. Otherwise I have to scour the internet looking at examples and piecing things together. Last time I ever take an online class that is for sure

$tan(U-V) = \frac{tanU - tanV}{1 + tanUtanV}$

if you look at it closely it is similiar to the to the given formula

so that the U value is $(X+Y)$ and the $V$ value is $Y$

so then $tan(U-V)$ is $tan((X+Y) - Y)$

or just $tan(X)$

I have taken distance learning also, but with forums like this you get lots of help some times better than a class room