What is the value of 6sin(-pi/4) ?

The value of 6sin(-pi/4) is -3sqrt(2)

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6sin(-pi/4)

6 sin (- \frac{π}{4})

- 32

Decimal Notation

- 4.24264 \dots

Solution steps

6 sin (- \frac{π}{4})

Rewrite using trig identities:

sin (- \frac{π}{4}) = - \frac{2}{2}

sin (- \frac{π}{4})

Use the following property:

sin (- x) = - sin (x)

sin (- \frac{π}{4}) = - sin (\frac{π}{4})

= - sin (\frac{π}{4})

Use the following trivial identity:

sin (\frac{π}{4}) = \frac{2}{2}

sin (\frac{π}{4})

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{2}{2}

= - \frac{2}{2}

= 6 (- \frac{2}{2})

Simplify

6 (- \frac{2}{2}) : - 32

6 (- \frac{2}{2})

Remove parentheses:

(- a) = - a

= - 6 \cdot \frac{2}{2}

Multiply fractions:

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

= - \frac{2 \cdot 6}{2}

Divide the numbers:

\frac{6}{2} = 3

= - 32

= - 32

- 5 cos (2 π)

sin (2 (7 5^{\circ}))

tan (arccos (\frac{3}{5}) + arctan (\frac{1}{4}))

arcsin (\frac{1.5}{1.33})

\frac{π}{6} + 2 cos (\frac{π}{6})