Evaluate 2sin(10 degrees )cos(10 degrees )

$2 \sin (10 °) \cos (10 °)$

Apply the sine double-angle identity.

$\sin (2 \cdot 10 °)$

Multiply $2$ by $10 °$ .

$\sin (20)$

The result can be shown in multiple forms.

Exact Form:

$\sin (20)$

Decimal Form:

$0.34202014 \dots$

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