GCSE maths exam tomorrow and in desperate need of help...:)

I was working on mymaths and just copied and pasted a few problems that I couldn't understand. The main one is 3D trigonometry and finding angles between planes.

1. Finding angles with the same 'sin' value but when the curve is reflected in the x axis.

Link: http://i297.photobucket.com/albums/m...ple/-2sinx.jpg

2. 3D - finding an angle between a line and a plane.

Link: http://i297.photobucket.com/albums/m...ple/cuboid.jpg

3. Similar question to above.

Link: http://i297.photobucket.com/albums/m...le/pyramid.jpg

4. Creating simultaneous equations from a graph.

Link: http://i297.photobucket.com/albums/m...eqsongraph.jpg

5. Volume question.

Link: http://i297.photobucket.com/albums/m...ple/thecup.jpg

6. Volume question.

Link: http://i297.photobucket.com/albums/m...e/cylinder.jpg

Sorry there are so many!

Thanks :)