What is the value of -3sin(-45) ?

The value of -3sin(-45) is (3sqrt(2))/2

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-3sin(-45)

- 3 sin (- 4 5^{\circ})

\frac{3 2}{2}

Decimal Notation

2.12132 \dots

Solution steps

- 3 sin (- 4 5^{\circ})

Rewrite using trig identities:

sin (- 4 5^{\circ}) = - \frac{2}{2}

sin (- 4 5^{\circ})

Use the following property:

sin (- x) = - sin (x)

sin (- 4 5^{\circ}) = - sin (4 5^{\circ})

= - sin (4 5^{\circ})

Use the following trivial identity:

sin (4 5^{\circ}) = \frac{2}{2}

sin (4 5^{\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{2}{2}

= - \frac{2}{2}

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

Simplify

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

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

Apply rule

- (- a) = a

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

Multiply fractions:

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

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

Apply radical rule:

2 = 2^{\frac{1}{2}}

= \frac{3 \cdot 2 ^{\frac{1}{2}}}{2}

Apply exponent rule:

\frac{x ^{a}}{x ^{b}} = \frac{1}{x ^{b - a}}

\frac{2 ^{\frac{1}{2}}}{2 ^{1}} = \frac{1}{2 ^{1 - \frac{1}{2}}}

= \frac{3}{2 ^{1 - \frac{1}{2}}}

Subtract the numbers:

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

= \frac{3}{2 ^{\frac{1}{2}}}

Apply radical rule:

2^{\frac{1}{2}} = 2

= \frac{3}{2}

Rationalize

\frac{3}{2} : \frac{3 2}{2}

\frac{3}{2}

Multiply by the conjugate

\frac{2}{2}

= \frac{3 2}{2 2}

22 = 2

22

Apply radical rule:

a a = a

22 = 2

= 2

= \frac{3 2}{2}

= \frac{3 2}{2}

= \frac{3 2}{2}

csc (- \frac{11 π}{2})

\frac{( 20 ) ^{2} sin ^{2} ( 2 5 ^{\circ} )}{2 ( 9.8 )}

11 sin (π)

cot (\frac{2 π}{4})

cos (44 0^{\circ})