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Thread starter VenomP
Start date Mar 23, 2009

VenomP

Member

Mar 23, 2009

Show that (1+cos2A)/(sin2a) = cotA

Drongoski

Well-Known Member

Mar 23, 2009

$Trigonometric\ Identity\\ \\ \frac{1 + cos\ 2a}{sin\ 2a}\ \ \ =\ \ \ \frac{2\ cos^{2}\ a}{2\sin\a\ cos\ a}\ \ \ =\ \ \ =\frac{cos\ a}{sin\ a}\ \ \ =\ \ \ cot\ a\\ \\ \\ QED$

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