Тригонометрия,решите

Question

Тригонометрия,решите

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Answer 1

Sin(pi/3+a)=sin(pi/3)cos(a)+cos(pi/3)sin(a),
sin(a)=sqrt(1-(cos(a))^2)=sqrt(1-225/289)=8/17,
sin(pi/3+a)=sqrt(3)*8/(17*2)+8/(17*2)=4sqrt(3)/17+4/17

Comments

Ты уверен(а)?