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

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 $\frac{- 4}{3} \to r \cdot \to b \int - 2 \to r \cdot \to a \frac{x + 1}{x^{2} + 1} d x = \frac{π}{2} .$ Then which of the following is(are) CORRECT ?

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