sin $43^\circ$ cos $47^\circ$ + cos $43^\circ$ sin $47^\circ$ = ?

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KollegeApply · Accepted Answer

1 Explanation: Given expression = sin $43^\circ$ cos ($90^\circ$ – $43^\circ$) + cos $43^\circ$ sin ($90^\circ$ – $43^\circ$) = sin $43^\circ$ · sin $43^\circ$ + cos $43^\circ$ · cos $43^\circ$ = sin2 $43^\circ$ + cos2 $43^\circ$ = 1

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