How would I get the exact value of Tan157.5 using the half angle formula?

asked Sep 6, 2016 8.2k views

5 votes

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5 votes

$\tan(157.5)=\tan(315/2)=(\sin(315))/(1+\cos(315))=(-√(2)/2)/(1+√(2)/2)=(-1)/(1+√(2))$

Krishna Meena answered Sep 10, 2016