guys pls help me with these qs
1) show that 12coshx - 8 sinhx >= 4√5
2) In a hyberpola the tangent crosses the asymptotes at A (postive slope)and B (negative slope) and crosses the x-axis at C.
i found the coordinates of A (a/(secØ-tanØ), b/(secØ-tanØ))
B (a/(secØ+tanØ), -b/(secØ+tanØ))
C (acosØ, 0)
which are the correct co-ordinates
how to do this??
show that teh area of triangle OCA is (abcosØ/2(secØ-tanØ))???? a diagram would be helpful. and find area of triangle OCB
finally find the area of OAB and show that this area is independent of teh position of P on the hyperbola.