What is the value of cos(((4pi)/3)/(2)) ?

The value of cos(((4pi)/3)/(2)) is -1/2

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cos(((4pi)/3)/(2))

cos (\frac{\frac{4 π}{3}}{2})

- \frac{1}{2}

Decimal Notation

- 0.5

Solution steps

cos (\frac{\frac{4 π}{3}}{2})

Simplify:

\frac{\frac{4 π}{3}}{2} = \frac{2 π}{3}

\frac{\frac{4 π}{3}}{2}

Apply the fraction rule:

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

= \frac{4 π}{3 \cdot 2}

Multiply the numbers:

3 \cdot 2 = 6

= \frac{4 π}{6}

Cancel the common factor:

2

= \frac{2 π}{3}

= cos (\frac{2 π}{3})

Use the following trivial identity:

cos (\frac{2 π}{3}) = - \frac{1}{2}

cos (\frac{2 π}{3})

cos (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} cos (x) 1 \frac{3}{2} \frac{2}{2} \frac{1}{2} 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{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} cos (x) - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2} 0 \frac{1}{2} \frac{2}{2} \frac{3}{2}

= - \frac{1}{2}

= - \frac{1}{2}

cot^{2} (+ 1)

sec (3 7^{\circ})

arctan (1.875)

4 sin (9 0^{\circ})

\frac{sin ( 3 0 ^{\circ} ) tan ( 3 0 ^{\circ} )}{sec ( 3 0 ^{\circ} ) - cos ( 3 0 ^{\circ} )}

What is the value of cos(((4pi)/3)/(2)) ?
The value of cos(((4pi)/3)/(2)) is -1/2