Be C a circumference of equation x² + y² = 4. If S and R are two lines that cross each other in the point P(1,3) and are tangents to the circumference, the value Cossine of the angle between R and S is?
I
no problems 4 ur face
Is it 1/5?
Yes
''Consider the parabola P of equation y = ax², with a > 0 and a point A of coordinates (x0,y0) that satisfies y0 < ax²0. Be S the area of the triangle ATT', where T and T' are the contact points of lines tangents to P passing through A.
Find the area of the triangle in function of x0, y0 and a.''
Can you solve this problem?
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