दो सदिशों `2hati+3hatj+4hatk` तथा `2hati+4hatj-4hatk` के बीच का कोण ज्ञात करें।

The scalar product of 2hati-3hatj+5hatk and 8hati+hatj+4hatk .

If veca = 3hati - hatj - 4hatk , vecb = -2hati + 4hatj - 3hatk and vec c = hati + 2hatj - hatk then |3veca - 2vec b + 4vec c | is equal to

Given veca = 2hati + hatj - 8 hatk and vecb = hati + 3hatj - 4hatk then |veca + vecb| = ……………………… .

Show that the vectors hati -2 hatj+3hatk , -2hati+3hatj-4hatk and hati -3hatj +5hatk are coplanar.