急,能不能在10.30之前解答,请仔细写出作答方法,很抱歉是英文的.

急,能不能在10.30之前解答,请仔细写出作答方法,很抱歉是英文的.
1) If x=sin 2 ,y =cos 2 ,find in terms of .(6 marks)
2) Show that the point P( ,)lies on the curve b x -a y =a b .(3 marks)
Show that the equation of the tangent to the curve at P is bx(t +1)-ay(t -1)=2abt.(4 marks)
The tangent cuts the x-axis at A and the y-axis at B.M is the mid-point of OA where O denotes the origin ,and H divides BM in the ratio 2:1 .Find the locus of H when t varies.(8 marks)
晕啊,怎么显示不出来