Find the missing measures.

Acylinder has volume 45π and radius 3. what is it’s height?

Evaluate cos2θ for cosθ = square root of 3/2

Find the directions in which the function increases and decreases most rapidly at upper p 0p0. then find the derivatives of the function in these directions. f(x,y)equals=x squared plus xy plus y squaredx2+xy+y2, upper p 0p0left parenthesis 1 comma negative 4 right parenthesis