может син не умнож, а син угла х7SINквX - 8SINXCOSX + COSквX = 0 | :SIMквX7 - 8CTGX + CTGквX = 0CTGквX - 8CTGX + 7 = 0CTGX = YYкв - 8Y + 7 = 0Y1*Y1 = 7Y1+Y2 = 8Y1=7Y2=1CTGX = 1X=0
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может син не умнож, а син угла х
7SINквX - 8SINXCOSX + COSквX = 0 | :SIMквX
7 - 8CTGX + CTGквX = 0
CTGквX - 8CTGX + 7 = 0
CTGX = Y
Yкв - 8Y + 7 = 0
Y1*Y1 = 7
Y1+Y2 = 8
Y1=7
Y2=1
CTGX = 1
X=0