Let \(a=i+j+2k\) and \(b=i-2j+3k\) be two vectors. Then the unit vector in the direction of \(a-b\) is
Let, \(a=i-j+2k\). Then the vector in the direction of a with magnitude \(5\) units is ?
In a triangle ABC,if \(cos^{2}A-sin^{2}B+cos^{2}C=0\) ,then the value of \(cosAcosBcosC\) is
For any real number \(x\), the least value of \(4cosx-3sinx+5\) is ?
For four observations X,X2,X3,X4, it is given that ,\(∑x_i^{2}=656\) and \(∑x_i=32\). Then, the variance of these four observations is ?