trygonometria klaudia0905: sin²x − 3sin x cos x + 2cos² = 0

M:

Mila: sin²x − 3sin x cos x + 2cos²x= 0 (sin²+cos²x−2sinx cosx)−sinx cos +cosx=0 (sinx−cosx)²−cosx(sinx−cosx)=0 (sin(x)−cos(x))*(sinx−2cosx)=0 (sin(x)−cos(x))=0 lub (sinx−2cosx)=0 ....