найдите значение выражения2(sin78cos18 + sin 168sin198)все в градусах
2(sin78cos18 + sin 168sin198)=2(SIN(90-12)COS18+SIN(180-12)sin(180+18))=
2(cos12cos18-sin12sin18)=2cos(12+18)=2cos30=2*V3/2=V3
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2(sin78cos18 + sin 168sin198)=2(SIN(90-12)COS18+SIN(180-12)sin(180+18))=
2(cos12cos18-sin12sin18)=2cos(12+18)=2cos30=2*V3/2=V3