[" If "0" is the origin,"],[P(x_(1),y_(1)),Q(x_(2),y_(2))" are two points "],[" then "OP*OQ*sin|POQ=]

If O is the origin and P(x_(1),y_(1)), Q(x_(2),y_(2)) are two points then OPxOQ sin angle POQ=

If O is the origin and P(x_(1),y_(1)), Q(x_(2),y_(2)) are two points then POxxOQ sin angle POQ=

If O is the origin and A(x_(1),y_(1)),B(x_(2), y_(2)) are two points then OA*OB*sin angleAOB=

If O be the origin and if P(x_(1),y_(1)) and P_(2)(x_(2),y_(2)) are two points,the OP_(1)(OP_(2))COS/_P_(1)OP_(2), is equal to

If O be the origin and if P(x_1, y_1) and P_2 (x_2, y_2) are two points, the OP_1 (OP_2) sin angle P_1OP_2 , is equal to

If O is the origin P(2,3) and Q(4,5) are two, points, then OP*OQ cos anglePOQ =

If O is the origin P(2,3) and Q(4,5) are two, points, then OP*OQ cos anglePOQ =

If 'alpha' be the angle subtended by the points P(x_(1),y_(1)) and Q(x_(2),y_(2)) at origin O, Show that OP.OQ.cos alpha=x_(1)x_(2)+y_(1)y_(2)