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solve 2 sin 0 = sin 20 for 0 degree 0 more than or equal 0 more than or equal 180

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Step-by-step explanation:

Im use x instead of theta.

$$2 \sin(x) = \sin(2x)$$

$$2 \sin(x) = 2 \sin(x) \cos(x)$$

$$1 = \cos(x)$$

$$x = 0$$
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