What is the value of sin((-2pi)/3) ?

The value of sin((-2pi)/3) is -(sqrt(3))/2

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sin((-2pi)/3)

sin (\frac{- 2 π}{3})

- \frac{3}{2}

Decimal Notation

- 0.86602 \dots

Solution steps

sin (\frac{- 2 π}{3})

Simplify

= sin (- \frac{2 π}{3})

Use the following property:

sin (- x) = - sin (x)

sin (- \frac{2 π}{3}) = - sin (\frac{2 π}{3})

= - sin (\frac{2 π}{3})

Use the following trivial identity:

sin (\frac{2 π}{3}) = \frac{3}{2}

sin (\frac{2 π}{3})

sin (x)

periodicity table with

2 πn

cycle:

x 0 \frac{π}{6} \frac{π}{4} \frac{π}{3} \frac{π}{2} \frac{2 π}{3} \frac{3 π}{4} \frac{5 π}{6} sin (x) 0 \frac{1}{2} \frac{2}{2} \frac{3}{2} 1 \frac{3}{2} \frac{2}{2} \frac{1}{2} x π \frac{7 π}{6} \frac{5 π}{4} \frac{4 π}{3} \frac{3 π}{2} \frac{5 π}{3} \frac{7 π}{4} \frac{11 π}{6} sin (x) 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{2} - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2}

= \frac{3}{2}

= - \frac{3}{2}

sin (7 5^{\circ}) + sin (1 5^{\circ})

tan^{2} (\frac{π}{4})

2 sec^{2} (0) tan (0)

arctan (cos (π))

tan (\frac{23 π}{12})