Re: Help- trigonometry

On 15 Jan 2006 04:50:06 -0800, hannah_jasmine@xxxxxxxxxxxxx wrote:

>Hey all,
>
>I'm an AS-level maths student and would be grateful of some help...
>
>
>How do you find cos and tan, when you only know sin and whether it is
>acute or obtuse?
>

Is this a question like sin x = 4/5 work out cos x or tan x
A combination of 3,4,5 and 5,12,13 crop up a lot.
Draw a right angled triangle. Sin = opp/hyp =4/5 so label opposite
side 4 hypotenuse 5. Work out size of adjacent using pythagoras. Use
tan = opp/adj and cos=adj/hyp. This comes up a lot in mechanics.
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