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Popular >

cos(30)*4

Solution

cos (3 0^{\circ}) \cdot 4

Solution

23

+1

Decimal Notation

3.46410 \dots

Solution steps

cos (3 0^{\circ}) \cdot 4

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}

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

Simplify

\frac{3}{2} \cdot 4 : 23

\frac{3}{2} \cdot 4

Multiply fractions:

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

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

Divide the numbers:

\frac{4}{2} = 2

= 23

= 23

Popular Examples

arctan((-18sqrt(2))/(-322-18sqrt(2)))

arctan (\frac{- 18 2}{- 322 - 18 2})

120 cos (1 5^{\circ})

cos (5 \cdot \frac{π}{6})

(sin (6 0^{\circ}))^{2}

sin(pi/4)*cos(pi/4)

sin (\frac{π}{4}) \cdot cos (\frac{π}{4})

Frequently Asked Questions (FAQ)

What is the value of cos(30)*4 ?
The value of cos(30)*4 is 2sqrt(3)