Question

Find the value of cos11π /6

Answer 1

you have it

Answer 2

its a + though not ÷

sin^2 + cos^2 = 1

\[\left( -\frac{ \sqrt{2} }{ 2 } \right)^2 +\left( -\frac{ \sqrt{2} }{ 2 } \right)^2 = \frac{ 2 }{ 4 }+\frac{ 2 }{ 4 }=\frac{ 4 }{ 4 }=1\]

Answer 3

got it?