cos150°=cos(180°-30°)=-cos30°=-√3/2
x²=(3√3)²+4²-(-√3/2)4*3√3. x>0
x²=27+16+18
x²=61
x=✓61
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cos150°=cos(180°-30°)=-cos30°=-√3/2
x²=(3√3)²+4²-(-√3/2)4*3√3. x>0
x²=27+16+18
x²=61
x=✓61