Algebra Examples

\sin (210)

$\sin (210)$

Step 1

Apply the reference angle by finding the angle with equivalent trig values in the first quadrant. Make the expression negative because sine is negative in the third quadrant.

- \sin (30)

$- \sin (30)$

Step 2

The exact value of

\sin (30)

$\sin (30)$ is

\frac{1}{2}

$\frac{1}{2}$ .

- \frac{1}{2}

$- \frac{1}{2}$

Step 3

The result can be shown in multiple forms.

Exact Form:

- \frac{1}{2}

$- \frac{1}{2}$

Decimal Form:

- 0.5

$- 0.5$

\sin (210)

$\sin (210)$

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