# math

how can the value of tan30 be found?

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1. ou need to know first of all that tanx=sinx/cosx

You will also need to know that:
sin0=0
sin30=1/2
sin45=sqrt/2
sin60=sqrt/2
sin 90 =1

and
cos0=1
cos30=sqrt/2
cos 45=sqrt/2
cos60=1/2
cos90=0

so you can recognize that 1/sqrt corresponds to tan30, since tan30=sin30/cos30
=1/2/sqrt/2 = 1/sqrt

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posted by Sara

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