Using sum or difference formulas, find the exact value of sin(165∘) express your answer in the form sin(165∘)=√a(√b−1)/4 for some numbers a and b

How do you find the circumfrance of a circle?

If value of cos330° is √3/2 then find tan165°.

If the altitude is drawn to the hypotenuse of a right triangle, then the two triangles formed are similar to the original triangle and to each other. which set of triangles shows the similar triangles created by the altitude in the diagram?