Question: A USGS geologist modeling seismic wave propagation uses the identity $\sin A \cos B = \frac{1}{2}[\sin(A+B) + \sin(A-B)]$. Apply this to compute $\sin 40^\circ \cos 25^\circ$ and express the result in exact form.

Mon, 04 May 2026 07:43:45 +0000

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