JEE Main 2019 — Math solution | Fundamenthol

JEE Main2019Math

Q.

If a unit vector $a$ makes angles $\frac{π}{3}$ with $\hat{i}$ , $\frac{π}{4}$ with $\hat{j}$ and $θ \in (0, π)$ with $\hat{k}$ , then a value of $θ$ is :

A
$\frac{5 π}{12}$
B
$\frac{2 π}{3}$
C
$\frac{π}{4}$
D
$\frac{5 π}{6}$

Solution

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