What is the value of 2(0.313)cos(30) ?

The value of 2(0.313)cos(30) is (313sqrt(3))/(1000)

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2(0.313)cos(30)

2 (0.313) cos (3 0^{\circ})

\frac{313 3}{1000}

Decimal

0.54213 \dots

Solution steps

2 (0.313) cos (3 0^{\circ})

= 2 \cdot \frac{313}{1000} cos (3 0^{\circ})

Use the following trivial identity:

cos (3 0^{\circ}) = \frac{3}{2}

cos (3 0^{\circ})

cos (x)

periodicity table with

36 0^{\circ} n

cycle:

x 0 3 0^{\circ} 4 5^{\circ} 6 0^{\circ} 9 0^{\circ} 12 0^{\circ} 13 5^{\circ} 15 0^{\circ} cos (x) 1 \frac{3}{2} \frac{2}{2} \frac{1}{2} 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{2} x 18 0^{\circ} 21 0^{\circ} 22 5^{\circ} 24 0^{\circ} 27 0^{\circ} 30 0^{\circ} 31 5^{\circ} 33 0^{\circ} cos (x) - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2} 0 \frac{1}{2} \frac{2}{2} \frac{3}{2}

= \frac{3}{2}

= 2 \cdot \frac{313}{1000} \cdot \frac{3}{2}

Simplify

2 \cdot \frac{313}{1000} \cdot \frac{3}{2} : \frac{313 3}{1000}

2 \cdot \frac{313}{1000} \cdot \frac{3}{2}

Multiply fractions:

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

= \frac{313 3 \cdot 2}{1000 \cdot 2}

Cancel the common factor:

2

= \frac{313 3}{1000}

= \frac{313 3}{1000}

What is the value of 2(0.313)cos(30) ?
The value of 2(0.313)cos(30) is (313sqrt(3))/(1000)