Cot (15 degrees) Find the two common angles that differ by 15 degrees. Rewrite this problem as the cotangent of a difference of those two angles.

Question

asked Dec 20, 2019 54.3k views

1 Answer

Sereizam · Answer 1 · 2019-12-26T15:17:51+0000

We have to write 15 degree as the difference of two angles.

And

15 = 45-30, 15=60-45

Now we have to use the formula of cotangent of a difference of those two angles.

And the formula is

$cot( \alpha - \beta) = ( cot \alpha cot \beta +1)/( cot \beta -cot \alpha )$

THerefore,

And that's the required expressions .