How to get 3/√10?

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Presto
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#1
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#1
I got the 0.94868... through my calculator but if I needed to get 3/√10, then how can I get that instead? It's not showing on my calculator when I press S<=>D

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username1732133
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#2
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#2
(Original post by Presto)
I got the 0.94868... through my calculator but if I needed to get 3/√10, then how can I get that instead? It's not showing on my calculator when I press S<=>D

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You would need to use some trigonometric identities but don't bother for this question. When it's necessary, it's generally much more straightforward than this one.
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Student-95
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#3
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You don't need to get 3/sqrt(10)
If it's not showing up on your calculator then your calculator just doesn't display it like that.
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Presto
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#4
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(Original post by BuryMathsTutor)
You would need to use some trigonometric identities but don't bother for this question. When it's necessary, it's generally much more straightforward than this one.
(Original post by Student-95)
You don't need to get 3/sqrt(10)
If it's not showing up on your calculator then your calculator just doesn't display it like that.
I know I don't need to but I'm just curious
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username1732133
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#5
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#5
(Original post by Presto)
I know I don't need to but I'm just curious
Either use trigonometrical identities, as I suggested earlier or use the angle bisector theorem. (Not in the A-level syllabus).
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Presto
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#6
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#6
(Original post by BuryMathsTutor)
Either use trigonometrical identities, as I suggested earlier or use the angle bisector theorem. (Not in the A-level syllabus).
Thank you
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