# Trig problem

• Dec 14th 2009, 10:32 AM
ldx2
Trig problem
Can someone solve this problem ? I'm stuck ...

$tan^{2}36\times tan^{2}72=5$
• Dec 14th 2009, 10:49 AM
bigwave
$
tan^{2}36\times tan^{2}72=5
$

ok cannot factor since it is x not +
• Dec 14th 2009, 11:09 AM
ldx2
I dont think you can do that... how about :
$\left ( tan36\times tan72 \right )^{2}$
$\left ( \frac{sin36\times sin72}{cos36\times cos72} \right )^{2}$

$\left ( xy \right )^{2}=x^{2}y^{2}$