Vectors 3a -5b and 2a +b are mutually perpendicular then the cosine of angle between them is
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i m not sure...
but i think as angle is 90° so
costheta = 0 because here theta is 90° and cos90° = 0
but i think as angle is 90° so
costheta = 0 because here theta is 90° and cos90° = 0
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