Find `|veca| and |vecb|` if `(veca+vecb).(veca-vecb)=8 and |veca|=8|vecb|`.

Find |veca|and |vecb|, if (veca+vecb).(veca-vecb) =8 and |veca|=8|vecb|

If |veca|=|vecb| , then (veca+vecb).(veca-vecb) is equal to

|veca pm vecb|^2 = |veca|^2 + |vecb|^2 pm 2|veca||vecb|cos theta and (veca + vecb).(veca - vecb) = |veca|^2 - |vecb|^2

Prove that: |(veca+vecb)xx(veca-vecb)|=2ab if veca_|_vecb

If |veca+vecb|=|veca-vecb| show that veca_|_vecb .

Find veca.vecb if |veca|2, |vecb|=5,a and |vecaxxvecb|=8

Find |veca-vecb| , if two vector veca and vecb are such that |veca|=4,|vecb|=5 and veca.vecb=3

If |veca + vecb| =60 |veca-vecb|=40 and |vecb| = 46 find |veca|

Find |veca-vecb| , if two vectors veca and vecb are such that |veca|=2,|vecb|=3 and veca.vecb=4 .