Need some help with trigonometry related questions

[AdventWolf]

Rath said:

AdventWolf said:

Ah my bad, but I know the formulas but I don't see how to convert this:

sqrt(2)/2 x 1/2 sqrt(2)/2 x sqrt(3)/2

to this:

1/4(sqrt(2) [plus] sqrt(6)

I would come up with the answer:

sqrt(2)/4 [plus] sqrt(6)/4

Which when put through a calculator is no where near the correct answer that 1/4(sqrt(2) [plus] sqrt(6) gives.

 

Edit: for some reason it is taking the plus signs out of the formulas..

Uhh, formulas are hard to read but if that is  1/4*(sqrt(2) sqrt(6))  then it's automatically 1/4*sqrt(2) 1/4*sqrt(6) simply through expansion.

I edited the post quickly after I posted that and I figured it out, but the second problem still puzzles me.