how do u prove : sec(A-B) = cos(A+B) / ( cosA^2 - sinB^2 )
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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:
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