Teaching AWES Army Public School TGT Mock Test 2024 Mathematics Trigonometry Properties of Triangles
If O be the origin and A (x1, y1), B (x2, y2) are two points, then what is (OA) (OB) cos ∠AOB?
1
\(\rm x_1^2+x_2^2\)
2
\(\rm y_1^2+y_2^2\)
3
x1x2 + y1y2
4
x1y1 + x2y2