$$\sin (45-30)= \sin 45 \times \cos 30- \cos 45 \times \sin 30$$
$\text{false}$
$$0.25881904510252074 = 0.6289289042585838 - 0.9238795325112867$$
$$0.25881904510252074=-0.2949506282527029$$
$$\text{false}$$
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