Упростите выражение sin37°30' * sin7°30'
по формуле sin a*sin b=(1/2)(cos (a-b)-cos (a+b))
(1/2)*(cos 30-cos 45)=(sqrt(3)/2-sqrt(2)/2)/2=(sqrt(3)-sqrt(2))/4
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по формуле sin a*sin b=(1/2)(cos (a-b)-cos (a+b))
(1/2)*(cos 30-cos 45)=(sqrt(3)/2-sqrt(2)/2)/2=(sqrt(3)-sqrt(2))/4