блин пожалуйста помогите a) sin(10)+2sin(25)*cos(35) б) sin(51)*cos(39)-sin(21)*cos(9)
sin10+sin60-sin10=sin60=sqrt(3)/2
1/2(sin90+sin12-sin30-sin12)=1/2(1-1/2)=1/4
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sin10+sin60-sin10=sin60=sqrt(3)/2
1/2(sin90+sin12-sin30-sin12)=1/2(1-1/2)=1/4