Two perpendicular unit vectors →a and →b are such that [→r→a� – InterviewSolution

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1.	Two perpendicular unit vectors →a and →b are such that [→r→a→b]=54, →r⋅(3→a+2→b)=0 and −43→r.→b∫−2→r.→ax+1x2+1dx=π2. Then which of the following is(are) correct ?
Answer» Two perpendicular unit vectors $\to a$ and $\to b$ are such that $[\to r \to a \to b] = \frac{5}{4},$ $\to r \cdot (3 \to a + 2 \to b) = 0$ and $\frac{- 4}{3} \to r . \to b \int - 2 \to r . \to a \frac{x + 1}{x^{2} + 1} d x = \frac{π}{2}$ . Then which of the following is(are) correct ?

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