Math Is Fun Forum

1-focus distance=2ae=10
                         2.7.e=10
                             e=5/7
also b^2=a^2(1-e^2) sub value find b ;ok
2-given x=secQ ---------1
           Y=tanQ------------2
squaring and subtracting 1 and 2'
x^2-y^2=sec^Q-tan^2Q
             =1. OK
3,4 not understand.ask clear, i will explain.