What is the value of 0.3*sin(30) ?

The value of 0.3*sin(30) is 3/20

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0.3*sin(30)

0.3 \cdot sin (3 0^{\circ})

\frac{3}{20}

Decimal

0.15

Solution steps

0.3 sin (3 0^{\circ})

= \frac{3}{10} sin (3 0^{\circ})

Use the following trivial identity:

sin (3 0^{\circ}) = \frac{1}{2}

sin (3 0^{\circ})

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

= \frac{1}{2}

= \frac{3}{10} \cdot \frac{1}{2}

Simplify

\frac{3}{10} \cdot \frac{1}{2} : \frac{3}{20}

\frac{3}{10} \cdot \frac{1}{2}

Multiply fractions:

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

= \frac{3 \cdot 1}{10 \cdot 2}

Multiply the numbers:

3 \cdot 1 = 3

= \frac{3}{10 \cdot 2}

Multiply the numbers:

10 \cdot 2 = 20

= \frac{3}{20}

= \frac{3}{20}