Q. 10

# Find a vector of magnitude 5√2, making an angle of with x-axis., with y-axis and an acute angle θ with z-axis.

Answer :

As we Know in 3D geometry a vector is given as:

…(1)

⇒Where l, m, n are directional cosines,

Now

Now using the property of Direction cosines,

i.e

Put (2) and other given values in equation (1),

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