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# maths trig HELLPPPP watch

1. how do you work these out without a calculator
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2. Sorry you've not had any responses about this. Are you sure you've posted in the right place? Here's a link to our subject forum which should help get you more responses if you post there.
3. sketch y = sinx, y = cosx, y = tanx... look at the graphs

eg to find arccos(1) you look at the horizontal line y = 1 and see where it cuts the cos graph.
4. Draw out a standard 3,4,5 right angle triangle and use SohCahToa from there.
5. (Original post by -Mathematician-)
Draw out a standard 3,4,5 right angle triangle and use SohCahToa from there.
I don't think that a 3 4 5 triangle will help here. There are two right angled triangles that will help - a 1 1 root(2) one and a 1 root(3) 2 one.

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