Question

Find the exact value of cot 15degrees. (Use Half Angle Formula)

Answer 1

An easier alternative would be to use the subtraction formula for \[\cos \left( 45-30 \right)^{o}\div \sin \left( 45-30 \right)^{o}\]

Answer 2

Gotcha. Thanks for your help

Answer 3

you're welcome.

Answer 4

\[2\sin²(θ) =1-\cos(2θ)\]
\[2\cos²(θ) =1+\cos(2θ)\]

\[\cot²(15) = \] \[ (1+ \cos30) \over (1- \cos30)\]