how do u prove : sec(A-B) = cos(A+B) / ( cosA^2 - sinB^2 )
Follow Math Help Forum on Facebook and Google+
Use the subtraction and addition formulas.
rewrite the left side as:
Multiply top and bottom by
and you should be able to hammer it into the right side.
Last edited by galactus; Jul 5th 2007 at 01:38 PM.
Originally Posted by dood how do u prove : sec(A-B) = cos(A+B) / ( cosA^2 - sinB^2 ) Haven't checked this, but logic tells me that:
View Tag Cloud