Evaluate : 1a0+b0+c0
Evaluate tan-1(a - b)/(1+ab)+ tan-1(b - c)/(1+bc)+ tan-1(c - a)/(1+cb) ; ab,bc,ac>-1
∣∣ ∣∣a1b1c1a2b2c2a3b3c3∣∣ ∣∣=5,then the value of∣∣ ∣∣b2c3−b3c2a3c2−a2c3a2b3−a3b2b3c1−b1c3a1c3−a3c1a3b1−a1b3b1c2−b2c1a2c1−a1c2a1b2−a2b1∣∣ ∣∣ is