What is the value of -5sin(pi/6) ?

The value of -5sin(pi/6) is -5/2

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-5sin(pi/6)

- 5 sin (\frac{π}{6})

- \frac{5}{2}

Decimal Notation

- 2.5

Solution steps

- 5 sin (\frac{π}{6})

Use the following trivial identity:

sin (\frac{π}{6}) = \frac{1}{2}

sin (\frac{π}{6})

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{1}{2}

= - 5 \cdot \frac{1}{2}

Simplify

- 5 \cdot \frac{1}{2} : - \frac{5}{2}

- 5 \cdot \frac{1}{2}

Convert element to fraction:

5 = \frac{5}{1}

= \frac{5}{1} \cdot \frac{1}{2}

Multiply fractions:

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

= - \frac{5 \cdot 1}{1 \cdot 2}

Cancel the common factor:

1

= - \frac{5}{2}

= - \frac{5}{2}

sin (60 0^{\circ}) + sec (66 0^{\circ}) - cot (69 0^{\circ})

csc (- \frac{7 π}{2})

arctan (\frac{50}{40})

arctan (\frac{6 3}{- 6})

(- 7) \cdot 0.15 \cdot 6.6 \cdot 1 0^{6} \cdot cos (6 5^{\circ})