What is the value of cos((11pi)/6) ?

The value of cos((11pi)/6) is (sqrt(3))/2

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cos((11pi)/6)

cos (\frac{11 π}{6})

\frac{3}{2}

Solution steps

cos (\frac{11 π}{6})

Rewrite using trig identities:

cos (π) cos (\frac{5 π}{6}) - sin (π) sin (\frac{5 π}{6})

= cos (π) cos (\frac{5 π}{6}) - sin (π) sin (\frac{5 π}{6})

Use the following trivial identity:

cos (π) = (- 1)

Use the following trivial identity:

cos (\frac{5 π}{6}) = - \frac{3}{2}

Use the following trivial identity:

sin (π) = 0

Use the following trivial identity:

sin (\frac{5 π}{6}) = \frac{1}{2}

= (- 1) (- \frac{3}{2}) - 0 \cdot \frac{1}{2}

Simplify

= \frac{3}{2}

sin (22. 5^{\circ})

cos (arcsin (\frac{1}{2}))

tan (67. 5^{\circ})

tan^{2} (x) = \frac{1}{3}

4 sin^{2} (x) - 1 = 0