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# can some1 just help me out a quickie watch

1. i no cos 30 is root 3 over 2

but like how would i figure that in an exam

do i just learn all the special angles?
2. maybe

or draw 2 triangles,
1st - angles of 90, 60, 30 and then the lengths 1,2, root 3
2nd - angles of 45, 45, 90 and lengths of 1,1, and root 2
then use trig to work out the angles
3. thats certainly the best way or you could do what i did and learn to reaconise the decimal expansions from the calc. lol
4. Due to the sheer number of times you'll come across them it's best to just learn the trig values for 0,30,45,60,90. Doesn't take much to learn them but it will save you a lot of time.

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Updated: April 12, 2006
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