What is the value of 20sin(-30) ?

English

Español

Português

Français

Deutsch

Italiano

Русский

中文(简体)

한국어

日本語

Tiếng Việt

עברית

العربية

Popular >

20sin(-30)

20 sin (- 3 0^{\circ})

- 10

Solution steps

20 sin (- 3 0^{\circ})

Rewrite using trig identities:

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

sin (- 3 0^{\circ})

Use the following property:

sin (- x) = - sin (x)

sin (- 3 0^{\circ}) = - sin (3 0^{\circ})

= - 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{1}{2}

= 20 (- \frac{1}{2})

Simplify

20 (- \frac{1}{2}) : - 10

20 (- \frac{1}{2})

Remove parentheses:

(- a) = - a

= - 20 \cdot \frac{1}{2}

Multiply fractions:

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

= - \frac{1 \cdot 20}{2}

Multiply the numbers:

1 \cdot 20 = 20

= - \frac{20}{2}

Divide the numbers:

\frac{20}{2} = 10

= - 10

= - 10

sin^{2} (\frac{- 0.0646 - ( - 1.0115 )}{2})

\frac{1275.007}{cos ( 1 4 ^{\circ} )}

sin (\frac{3}{2}) π

arcsin (\frac{- 3}{2})

cos (\frac{\frac{π}{4} + 3}{\frac{π}{4}} - \frac{π}{2})