What is the value of 4sin(pi/3)cos((5pi)/6) ?

The value of 4sin(pi/3)cos((5pi)/6) is -3

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4sin(pi/3)cos((5pi)/6)

4 sin (\frac{π}{3}) cos (\frac{5 π}{6})

- 3

Solution steps

4 sin (\frac{π}{3}) cos (\frac{5 π}{6})

Use the following trivial identity:

sin (\frac{π}{3}) = \frac{3}{2}

sin (\frac{π}{3})

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{3}{2}

Use the following trivial identity:

cos (\frac{5 π}{6}) = - \frac{3}{2}

cos (\frac{5 π}{6})

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

= 4 \cdot \frac{3}{2} (- \frac{3}{2})

Simplify

4 \cdot \frac{3}{2} (- \frac{3}{2}) : - 3

4 \cdot \frac{3}{2} (- \frac{3}{2})

Remove parentheses:

(- a) = - a

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

33 \cdot 4 = 12

33 \cdot 4

Apply radical rule:

a a = a

33 = 3

= 3 \cdot 4

Multiply the numbers:

3 \cdot 4 = 12

= 12

= - \frac{12}{2 \cdot 2}

Multiply the numbers:

2 \cdot 2 = 4

= - \frac{12}{4}

Divide the numbers:

\frac{12}{4} = 3

= - 3

= - 3

arcsin (0.55)

arcsin (0.36)

sin (52. 5^{\circ}) cos (7. 5^{\circ})

cos (1 5^{\circ}) cos (4 5^{\circ}) - sin (1 5^{\circ}) sin (4 5^{\circ})

cos (1.8)

What is the value of 4sin(pi/3)cos((5pi)/6) ?
The value of 4sin(pi/3)cos((5pi)/6) is -3