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

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

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csc(-2/3 pi)

csc (- \frac{2}{3} π)

- \frac{2 3}{3}

Decimal Notation

- 1.15470 \dots

Solution steps

csc (- \frac{2}{3} π)

Simplify:

- \frac{2}{3} π = - \frac{2 π}{3}

- \frac{2}{3} π

Multiply fractions:

a \cdot \frac{b}{c} = \frac{a \cdot b}{c}

= - \frac{2 π}{3}

= csc (- \frac{2 π}{3})

Use the following property:

csc (- x) = - csc (x)

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

= - csc (\frac{2 π}{3})

Rewrite using trig identities:

csc (\frac{2 π}{3}) = \frac{2 3}{3}

csc (\frac{2 π}{3})

Rewrite using trig identities:

\frac{1}{sin ( \frac{2 π}{3} )}

csc (\frac{2 π}{3})

Use the basic trigonometric identity:

csc (x) = \frac{1}{sin ( x )}

= \frac{1}{sin ( \frac{2 π}{3} )}

= \frac{1}{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{1}{\frac{3}{2}}

Simplify

\frac{1}{\frac{3}{2}} : \frac{2 3}{3}

\frac{1}{\frac{3}{2}}

Apply the fraction rule:

\frac{1}{\frac{b}{c}} = \frac{c}{b}

= \frac{2}{3}

Rationalize

\frac{2}{3} : \frac{2 3}{3}

\frac{2}{3}

Multiply by the conjugate

\frac{3}{3}

= \frac{2 3}{3 3}

33 = 3

33

Apply radical rule:

a a = a

33 = 3

= 3

= \frac{2 3}{3}

= \frac{2 3}{3}

= \frac{2 3}{3}

= - \frac{2 3}{3}

sin (0.43)

tan (- 49 5^{\circ})

3.1 cos (4 5^{\circ})

22 cos (\frac{3 π}{4})

arccos (- \frac{4}{7})