The non-zero vectors are a, b and c are related by a = 8 b and c = - 7 b. Then the angle between a and c is:

Vector Algebra: JEE Main 2008 Mathematics question

JEE Main 2008 · Annual, Paper 1 · Q5684

JEE Main 2008Annual, Paper 1MathematicsMediumVector Algebra184× since 2002

The non-zero vectors are

{\overrightarrow a ,\overrightarrow b }

and

{\overrightarrow c }

are related by

{\overrightarrow a = 8\overrightarrow b }

and

{\overrightarrow c = - 7\overrightarrow b \,\,.}

Then the angle between

{\overrightarrow a }

and

{\overrightarrow c }

is :

JEE Main 2008 · Annual, Paper 1 · Q5684

JEE Main 2008Annual, Paper 1MathematicsMediumVector Algebra184× since 2002

The non-zero vectors are

{\overrightarrow a ,\overrightarrow b }

and

{\overrightarrow c }

are related by

{\overrightarrow a = 8\overrightarrow b }

and

{\overrightarrow c = - 7\overrightarrow b \,\,.}

Then the angle between

{\overrightarrow a }

and

{\overrightarrow c }

is :