Question

please solve this question of MATHS ........**​

Answer 1

Step-by-step explanation:

=> a+b is unit vector

=> |a+b| = 1

=> (a+b)•(a+b) = 1

=> |a²| + |b²| + 2a•b = 1

a and b are also unit vectors.

=> 1 + 1 + 2ab = 1

=> 2ab = -1

=> ab = -1/2

=> |a| |b| cos@ = -1/2

=> 1 •1 • cos@ = -1/2

=> cos@ = -1/2

=> @ = 120 degree.

Answer 2

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