Assertion: If position vector is given by `hatr=sinhati+costhatj-7thatk`, then magnitude of

Assertion: If position vector is given by `hatr=sinhati+costhatj-7thatk`, then magnitude of acceleration `|veca|=1` Reason: The angles which the vector `vecA=A_(1)veci+A_(3)hatk` makes with the co-ordinate asex are given by `cos alpha=(A_(1))/(A), cos beta=(A_(2))/(A)& cos gamma=(A_(3))/(A)`.