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sin patrat 120 cos patrat 60

Răspuns :

sin²120*cos²60 = cos²(90-120)cos²60 = (√3/2)²*(1/2)² = 3/16

Sin patrat 120° cos patrat 60° =sin²60°cos°60=(√3/2)² *(1/2)²=(3/4) 8(1/4)=3/16
am tinut cont ca sin (180°-α)=sinα, unde α∈(0;90°)